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1.
Parasitol Res ; 122(10): 2245-2257, 2023 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-37480507

RESUMO

Tropical theileriosis, babesiosis, and anaplasmosis are the most dominant tick-borne infections in North Africa where they cause significant economic losses in ruminants' industry. The aim of the present work was to study infections and co-infection patterns in 66 cattle with clinical signs of piroplasmosis and/or anaplasmosis in two localities, Beni Hamidene and Grarem Gouga, districts of Constantine and Mila (Northeast of Algeria), respectively. This study was conducted between early May and late September during four years 2017, 2018, 2020, and 2021. PCR showed that the most frequent pathogen in cattle with clinical signs of piroplasmosis and/or anaplasmosis was Theileria annulata (66/66; 100%) followed by Babesia bovis (21/66; 31.8%), Anaplasma marginale (15/66; 22.7%), and Babesia bigemina (3/66; 4.5%) (p < 0.001). Giemsa-stained blood smears examinations revealed that 66.7% (44/66); 10.6% (7/66); and 9.1% (6/66) of cattle were infected by T. annulata, Babesia spp., and A. marginale, respectively (p < 0.001). PCR revealed seven co-infection patterns: T. annulata/A. marginale (15/66; 22.7%), T. annulata/B. bovis (21/66; 31.8%), T. annulata/B. bigemina (3/66; 4.5%), T. annulata/A. marginale/B. bovis (7/66; 10.6%), T. annulata/B. bovis/B. bigemina (2/66; 3%), T. annulata/A. marginale/B. bigemina (1/66; 1.5%), and T. annulata/A. marginale/B. bigemina/B. bovis (1/66; 1.5%). Phylogenetic analyses showed that T. annulata Tams1 and B. bigemina gp45 sequences were identical to isolates from Mauritania and South Africa, respectively. The three A. marginale amplicons obtained herein had 99.63 to 99.88% similarity between them. This study provides data that can be used to improve control programs targeting these cattle hemopathogens.


Assuntos
Anaplasmose , Babesia , Babesiose , Coinfecção , Bovinos , Animais , Argélia/epidemiologia , Filogenia , Babesiose/epidemiologia , Anaplasmose/epidemiologia , Coinfecção/epidemiologia , Coinfecção/veterinária , Estações do Ano , Babesia/genética
2.
Yale J Biol Med ; 94(2): 227-248, 2021 06.
Artigo em Inglês | MEDLINE | ID: mdl-34211344

RESUMO

The close phylogenetic relationship between humans and other primates creates exceptionally high potential for pathogen exchange. The surveillance of pathogens in primates plays an important role in anticipating possible outbreaks. In this study, we conducted a molecular investigation of pathogenic bacteria in feces from African nonhuman primates (NHPs). We also investigated the pathogens shared by the human population and gorillas living in the same territory in the Republic of Congo. In total, 93% of NHPs (n=176) and 95% (n=38) of humans were found to carry at least one bacterium. Non-pallidum Treponema spp. (including T. succinifaciens, T. berlinense, and several potential new species) were recovered from stools of 70% of great apes, 88% of monkeys, and 79% of humans. Non-tuberculosis Mycobacterium spp. were also common in almost all NHP species as well as in humans. In addition, Acinetobacter spp., members of the primate gut microbiota, were mainly prevalent in human and gorilla. Pathogenic Leptospira spp. were highly present in humans (82%) and gorillas (66%) stool samples in Congo, but were absent in the other NHPs, therefore suggesting a possible gorillas-humans exchange. Particular attention will be necessary for enteropathogenic bacteria detected in humans such as Helicobacter pylori, Salmonella spp. (including S. typhi/paratyphi), Staphyloccocus aureus, and Tropheryma whipplei, some of which were also present in gorillas in the same territory (S. aureus and T. whipplei). This study enhances our knowledge of pathogenic bacteria that threaten African NHPs and humans by using a non-invasive sampling technique. Contact between humans and NHPs results in an exchange of pathogens. Ongoing surveillance, prevention, and treatment strategies alone will limit the spread of these infectious agents.


Assuntos
Infecções Bacterianas , Hominidae , África , Animais , Humanos , Filogenia , Primatas , Staphylococcus aureus
3.
Trop Anim Health Prod ; 53(1): 167, 2021 Feb 16.
Artigo em Inglês | MEDLINE | ID: mdl-33594496

RESUMO

Cattle piroplasmoses are tick-borne diseases, spread worldwide that cause significant economic losses. A participatory epidemiological study was conducted individually or in focus groups with 73 cattle owners in Beni Hamidene locality (district of Constantine, Algeria). The aim of this study was to study cattle owners' knowledge, attitude and perception on cattle piroplasmosis. Proportional piling technique was used to determinate most common cattle diseases, and to evaluate economic impact of diseases according to the interwieved farmers. Theileriosis (49/73; 67.1%) and babesiosis (44/73; 60.3%) were considered the most important bovine diseases. No zoonotic disease was cited by the interviewed cattle owners. According to the majority of cattle owners, theileriosis and babesiosis are deadly diseases (87.3 and 78.1%, respectively). All cattle owners (73/73) cited fever as the most common symptom of tropical theileriosis. Some of them (14/73; 19.2%) do not make distinction between theileriosis and babesiosis. According to cattle owners (65/73; 89.0%), the use of acaricide is the most appropriate tick control method. This study provides information about knowledge on bovine piroplasmoses in Algeria. These information could be considered when performing control programmes by both animal decision-makers and field veterinarians.


Assuntos
Babesiose , Doenças dos Bovinos , Doenças Transmitidas por Carrapatos , Argélia/epidemiologia , Animais , Babesiose/epidemiologia , Bovinos , Doenças dos Bovinos/epidemiologia , Conhecimentos, Atitudes e Prática em Saúde , Percepção , Doenças Transmitidas por Carrapatos/epidemiologia , Doenças Transmitidas por Carrapatos/veterinária
4.
Int Arch Allergy Immunol ; 178(1): 10-18, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30380546

RESUMO

BACKGROUND: The aim of this work was to understand the molecular features that trigger the cross-reactivity observed between Der p 5 from Dermatophagoides pteronyssinus, Blo t 5 from Blomia tropicalis, and Der f 5 from D. farinae. METHODS: We collected serum from 60 house dust mite (HDM)-allergic patients residing in the Dellys area of Boumerdès province in northern Algeria. The presence of specific IgE to Der p 5, Der f 5, and Blo t 5 was analyzed. We performed in silico analysis of the structure of the different allergens in order to identify epitopes that can elicit the cross-reactivity of the sera. Synthetic peptides corresponding to the linear epitope sequence of Der p 5, Der f 5, and Blo t 5 were used to evaluate its implication in the cross-reactivity between the allergens. We also modified the sequence of the conformational epitope of Der p 5 by site-directed mutagenesis to mimic Blo t 5. RESULTS: Several sera of patients allergic to HDM contained specific IgE antibodies to Der p 5 and Blo t 5. We demonstrated that the linear epitope of Der p 5 and Blo t 5 is not involved in the cross-reactivity of the sera. Furthermore, mutations introduced in the sequence of Der p 5 to mimic Blo t 5 could not modulate the cross-reactivity between them. CONCLUSIONS: The major linear IgE epitopes of Der p 5 and Blo t 5 are involved in species-specific recognition. Our results may be useful for the development of a hypoallergenic vaccine against HDM group 5 allergens.


Assuntos
Alérgenos/imunologia , Antígenos de Dermatophagoides/imunologia , Proteínas de Artrópodes/imunologia , Reações Cruzadas/imunologia , Dermatophagoides pteronyssinus/imunologia , Epitopos/imunologia , Imunoglobulina E/imunologia , Adulto , Alérgenos/genética , Animais , Especificidade de Anticorpos , Antígenos de Dermatophagoides/genética , Proteínas de Artrópodes/genética , Dermatophagoides pteronyssinus/genética , Ensaio de Imunoadsorção Enzimática , Mapeamento de Epitopos , Epitopos/química , Epitopos/genética , Feminino , Humanos , Hipersensibilidade/sangue , Hipersensibilidade/diagnóstico , Hipersensibilidade/imunologia , Imunoglobulina E/sangue , Masculino , Pessoa de Meia-Idade , Mutagênese , Proteínas Recombinantes , Adulto Jovem
5.
J Virol ; 91(14)2017 07 15.
Artigo em Inglês | MEDLINE | ID: mdl-28446673

RESUMO

African swine fever virus, a double-stranded DNA virus that infects pigs, is the only known member of the Asfarviridae family. Nevertheless, during our isolation and sequencing of the complete genome of faustovirus, followed by the description of kaumoebavirus, carried out over the past 2 years, we observed the emergence of previously unknown related viruses within this group of viruses. Here we describe the isolation of pacmanvirus, a fourth member in this group, which is capable of infecting Acanthamoeba castellanii Pacmanvirus A23 has a linear compact genome of 395,405 bp, with a 33.62% G+C content. The pacmanvirus genome harbors 465 genes, with a high coding density. An analysis of reciprocal best hits shows that 31 genes are conserved between African swine fever virus, pacmanvirus, faustovirus, and kaumoebavirus. Moreover, the major capsid protein locus of pacmanvirus appears to be different from those of kaumoebavirus and faustovirus. Overall, comparative and genomic analyses reveal the emergence of a new group or cluster of viruses encompassing African swine fever virus, faustovirus, pacmanvirus, and kaumoebavirus.IMPORTANCE Pacmanvirus is a newly discovered icosahedral double-stranded DNA virus that was isolated from an environmental sample by amoeba coculture. We describe herein its structure and replicative cycle, along with genomic analysis and genomic comparisons with previously known viruses. This virus represents the third virus, after faustovirus and kaumoebavirus, that is most closely related to classical representatives of the Asfarviridae family. These results highlight the emergence of previously unknown double-stranded DNA viruses which delineate and extend the diversity of a group around the asfarvirus members.


Assuntos
Acanthamoeba castellanii/virologia , Vírus de DNA/classificação , Vírus de DNA/isolamento & purificação , DNA Viral/química , DNA Viral/genética , Acanthamoeba castellanii/ultraestrutura , Composição de Bases , Análise por Conglomerados , Vírus de DNA/genética , Genes Virais , Microscopia Eletrônica de Transmissão , Filogenia , Sintenia , Vírion/ultraestrutura
6.
Trop Anim Health Prod ; 50(3): 561-564, 2018 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-29134541

RESUMO

This study was performed to investigate the presence of bovine herpesvirus-1 (BHV-1), bovine leukemia virus (BLV) and bovine viral diarrhea virus (BVDV) infections in dromedary camels (Camelus dromaderius) kept in mixed herds with sheep and goats in Algeria, since the prevalence of BHV-1, BVDV, and BLV infections among dromedary camels in Algeria is unknown. Totally, 111 camel sera were collected from two provinces (Laghouat and Ghardaia) in Algeria. The sera were analyzed for BHV-1 specific antibodies, BVDV specific antibodies and BVDV antigen using the ELISA, and BLV nucleic acid using PCR. The seropositivity rate was 9.0% for BVDV-specific antibody, although 41.4% of camels tested were positive for BVDV antigen. Moreover, there was no evidence of BHV-1 and BLV infections. The results indicated that camels might represent an important source for BVDV infection in all ruminants, including cattle, sheep, and goats bred in mixed herds in Algeria, since they had a higher BVDV prevalence rates. Therefore, the prevention and control measures for BVDV infection should put in place in camel populations to limit the spread of BVDV infection to ruminant populations in Algeria.


Assuntos
Doença das Mucosas por Vírus da Diarreia Viral Bovina/imunologia , Camelus/imunologia , Camelus/virologia , Leucose Enzoótica Bovina/imunologia , Infecções por Herpesviridae/imunologia , Argélia , Animais , Anticorpos Antivirais/sangue , Bovinos , Diarreia , Vírus da Diarreia Viral Bovina Tipo 1 , Vírus da Diarreia Viral Bovina , Ensaio de Imunoadsorção Enzimática/veterinária , Cabras , Herpesvirus Bovino 1 , Vírus da Leucemia Bovina , Reação em Cadeia da Polimerase , Ovinos
7.
Clin Infect Dis ; 65(suppl_1): S30-S38, 2017 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-28859353

RESUMO

In the last decade, the Chikungunya and Zika virus outbreaks have turned public attention to the possibility of the expansion of vector-borne infectious diseases worldwide. Medical entomology is focused on the study of arthropods involved in human health. We review here some of the research approaches taken by the medical entomology team of the University Hospital Institute (UHI) Méditerranée Infection of Marseille, France, with the support of recent or representative studies. We propose our approaches to technical innovations in arthropod identification and the detection of microorganisms in arthropods, the use of arthropods as epidemiological or diagnostic tools, entomological investigations around clinical cases or within specific populations, and how we have developed experimental models to decipher the interactions between arthropods, microorganisms, and humans.


Assuntos
Infecções por Arbovirus/transmissão , Vetores Artrópodes , Pesquisa Biomédica , Entomologia , Animais , Infecções por Arbovirus/prevenção & controle , Infecções por Arbovirus/virologia , Vetores Artrópodes/microbiologia , Vetores Artrópodes/parasitologia , Vetores Artrópodes/virologia , Artrópodes/microbiologia , Artrópodes/parasitologia , Artrópodes/virologia , Percevejos-de-Cama/microbiologia , Percevejos-de-Cama/parasitologia , Febre de Chikungunya/prevenção & controle , Febre de Chikungunya/transmissão , Febre de Chikungunya/virologia , Culicidae/virologia , Modelos Animais de Doenças , Surtos de Doenças/prevenção & controle , Humanos , Insetos Vetores/parasitologia , Carrapatos/parasitologia , Infecção por Zika virus/prevenção & controle , Infecção por Zika virus/transmissão , Infecção por Zika virus/virologia
8.
Proteomics ; 16(24): 3148-3160, 2016 12.
Artigo em Inglês | MEDLINE | ID: mdl-27862981

RESUMO

The rapid spread of vector-borne diseases demands the development of an innovative strategy for arthropod monitoring. The emergence of MALDI-TOF MS as a rapid, low-cost, and accurate tool for arthropod identification is revolutionizing medical entomology. However, as MS spectra from an arthropod can vary according to the body part selected, the sample homogenization method used and the mode and duration of sample storage, standardization of protocols is indispensable prior to the creation and sharing of an MS reference spectra database. In the present study, manual grinding of Anopheles gambiae Giles and Aedes albopictus mosquitoes at the adult and larval (L3) developmental stages was compared to automated homogenization. Settings for each homogenizer were optimized, and glass powder was found to be the best sample disruptor based on its ability to create reproducible and intense MS spectra. In addition, the suitability of common arthropod storage conditions for further MALDI-TOF MS analysis was kinetically evaluated. The conditions that best preserved samples for accurate species identification by MALDI-TOF MS were freezing at -20°C or in liquid nitrogen for up to 6 months. The optimized conditions were objectified based on the reproducibility and stability of species-specific MS profiles. The automation and standardization of mosquito sample preparation methods for MALDI-TOF MS analyses will popularize the use of this innovative tool for the rapid identification of arthropods with medical interest.


Assuntos
Culicidae/química , Proteínas de Insetos/análise , Proteômica/métodos , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz/métodos , Animais , Análise por Conglomerados , Culicidae/classificação , Larva/química , Proteômica/economia , Proteômica/normas , Especificidade da Espécie , Manejo de Espécimes , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz/economia , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz/normas
9.
Clin Microbiol Rev ; 26(4): 657-702, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-24092850

RESUMO

Tick-borne rickettsioses are caused by obligate intracellular bacteria belonging to the spotted fever group of the genus Rickettsia. These zoonoses are among the oldest known vector-borne diseases. However, in the past 25 years, the scope and importance of the recognized tick-associated rickettsial pathogens have increased dramatically, making this complex of diseases an ideal paradigm for the understanding of emerging and reemerging infections. Several species of tick-borne rickettsiae that were considered nonpathogenic for decades are now associated with human infections, and novel Rickettsia species of undetermined pathogenicity continue to be detected in or isolated from ticks around the world. This remarkable expansion of information has been driven largely by the use of molecular techniques that have facilitated the identification of novel and previously recognized rickettsiae in ticks. New approaches, such as swabbing of eschars to obtain material to be tested by PCR, have emerged in recent years and have played a role in describing emerging tick-borne rickettsioses. Here, we present the current knowledge on tick-borne rickettsiae and rickettsioses using a geographic approach toward the epidemiology of these diseases.


Assuntos
Infecções por Rickettsia/microbiologia , Rickettsia/classificação , Rickettsia/isolamento & purificação , Febre Maculosa das Montanhas Rochosas/epidemiologia , Doenças Transmitidas por Carrapatos/epidemiologia , Doenças Transmitidas por Carrapatos/microbiologia , Carrapatos/microbiologia , África/epidemiologia , América/epidemiologia , Animais , Ásia/epidemiologia , Australásia/epidemiologia , Febre Botonosa/epidemiologia , Febre Botonosa/microbiologia , Doenças Transmissíveis Emergentes/epidemiologia , Doenças Transmissíveis Emergentes/microbiologia , Europa (Continente)/epidemiologia , Feminino , Genoma Bacteriano , Humanos , Masculino , Filogenia , Rickettsia/genética , Infecções por Rickettsia/diagnóstico , Infecções por Rickettsia/tratamento farmacológico , Infecções por Rickettsia/epidemiologia , Febre Maculosa das Montanhas Rochosas/microbiologia , Doenças Transmitidas por Carrapatos/diagnóstico , Doenças Transmitidas por Carrapatos/tratamento farmacológico
10.
Mol Ecol ; 23(5): 1204-12, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-24400877

RESUMO

Bartonella quintana is transmitted by the infected faeces of body lice. Recently, this bacterium was detected in cat fleas (Ctenocephalides felis) and in two humans with chronic adenopathy whose only risk factor was contact with cat fleas. In this study, a total of 960 C. felis were divided into 12 groups (2 control groups and 10 infected groups) each containing 80 fleas. The fleas were fed B. quintana-inoculated human blood at different dilutions (≈3.6 × 10(4) - 8.4 × 10(9) bacteria) for 4 days via an artificial membrane. Subsequently, all flea groups were fed uninfected blood until day 13 postinfection (dpi). On day 3 pi, B. quintana was detected with two specific genes by quantitative PCR in 60-100% of randomly chosen fleas per dilution: 52% (26/50) in the infected fleas in Trial 1 and 90% (45/50) of the fleas in Trial 2. B. quintana was also identified by molecular and culture assays in flea faeces. The average number of B. quintana as determined by qPCR decreased until the 11th dpi and was absent in both trials at the 13th dpi. Bacteria were localized only in the flea gastrointestinal gut by specific immunohistochemistry. Our results indicate that cat fleas can acquire B. quintana by feeding and release viable organisms into their faeces. Therefore, fleas may play a role as vectors of trench fever or other clinical manifestations that are caused by B. quintana. However, the biological role of C. felis in the transmission of B. quintana under natural conditions is yet to be defined.


Assuntos
Bartonella quintana/isolamento & purificação , Ctenocephalides/microbiologia , Insetos Vetores/microbiologia , Animais , Carga Bacteriana , Fezes/microbiologia , Humanos , Febre das Trincheiras/transmissão
11.
Comp Immunol Microbiol Infect Dis ; 103: 102075, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37922744

RESUMO

Toscana virus is a sandfly-borne human pathogen belonging to Phlebovirus genus into Phenuiviridae family. It is emerging in north Africa posing a complex threat to public health. TOSV is heavily affecting sandfly-exposed people in northern Algeria. A larger distribution has recently been stated in Algeria by using dog sera. Dog exposure to TOSV was repeatedly identified in north Algeria, with 4.56% lately detected to possess respective neutralizing antibodies. However, evidence for TOSV has only been observed in dogs among various species of domestic animals. Therefore, we attempted to assess sera from 221 livestock comprising cattle, sheep, goats, rabbits and horses, to identify the presence of TOSV neutralizing antibodies. The study was conducted during 2017, in 11 areas from the governorates of Blida, Medea, Algiers, Tipaza, Ain Defla, Tissemsilt in the north center, and Setif, Mila, Tizi Ouzou, Jijel in the northeast of Algeria. Positive results were obtained in 14.6% (12/82) cattle, 17.18% (11/64) sheep, 15% (3/20) horses and 3.33% (1/30) goats, whereas rabbits remained negative. Positive samples originated mainly from the north centre, with new areas being first-ever detected. The seroprevalence was noticed to be very strongly related to sample origin (p < 0.01). Females (OR=4.09) were observed to be more likely infected. Our findings represent a further proof of TOSV circulation in Algeria. Moreover, they revealed a potential role of livestock (p = 0.00731) in its natural cycle. This fact emphasize how important is to elucidate the exact contribution of livestock to the epidemiology of sandfly-borne phleboviruses, and their impact on public health.


Assuntos
Phlebovirus , Vírus da Febre do Flebótomo Napolitano , Feminino , Humanos , Animais , Cães , Bovinos , Cavalos , Ovinos , Coelhos , Gado , Argélia/epidemiologia , Estudos Soroepidemiológicos , Anticorpos Antivirais , Anticorpos Neutralizantes , Cabras
12.
Comp Immunol Microbiol Infect Dis ; 100: 102035, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37572591

RESUMO

Rift Valley fever (RVF) is a mosquito-borne viral zoonosis caused by the Rift Valley fever virus (RVFV). The present work aims to investigate the epidemiological status and identify the risk factors associated with RVFV infection in dromedary camels (Camelus dromedarius) from southern Algeria. A total of 269 sera of apparently healthy camels was collected and tested using a competitive Enzyme-Linked Immunosorbent Assay (ELISA). Overall, 72 camels (26.7 %, 95 % CI: 21.4-32) were seropositive to RVFV. IgG antibodies were found to be most prevalent in camels from south-western areas, particularly in Tindouf wilaya (52.38 %, p < 0.0001), and in camels introduced from bordering Sahelian countries (35.8 %) (OR = 8.75, 95 %CI: 2.14-35.81). No anti-RVFV antibodies were detected in sera collected from local camels (0 %). Adult (5-10 years) and aged (>10 years) camels have a significantly higher risk of being infected by RVFV (OR = 2.15; 95 %CI = 1.21-3.81, OR = 2.05; 95 %CI = 1.03-4.11, respectively). This report indicated that dromedaries imported to the south-western areas are exposed to RVFV and may contribute to its spread in Algerian territories.

13.
J Clin Microbiol ; 50(7): 2229-33, 2012 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-22573588

RESUMO

Louse-borne diseases are prevalent in the homeless, and body louse eradication has thus far been unsuccessful in this population. We aim to develop a rapid and robust genotyping method usable in large field-based clinical studies to monitor permethrin resistance in the human body louse Pediculus humanus corporis. We assessed a melting curve analysis genotyping method based on real-time PCR using hybridization probes to detect the M815I-T917I-L920F knockdown resistance (kdr) mutation in the paraorthologous voltage-sensitive sodium channel (VSSC) α subunit gene, which is associated with permethrin resistance. The 908-bp DNA fragment of the VSSC gene, encoding the α subunit of the sodium channel and encompassing the three mutation sites, was PCR sequenced from 65 lice collected from a homeless population. We noted a high prevalence of the 3 indicated mutations in the body lice collected from homeless people (100% for the M815I and L920F mutations and 56.73% for the T917I mutation). These results were confirmed by melting curve analysis genotyping, which had a calculated sensitivity of 100% for the M815I and T917I mutations and of 98% for the L920F mutation. The specificity was 100% for M815I and L920F and 96% for T917I. Melting curve analysis genotyping is a fast, sensitive, and specific tool that is fully compatible with the analysis of a large number of samples in epidemiological surveys, allowing the simultaneous genotyping of 96 samples in just over an hour (75 min). Thus, it is perfectly suited for the epidemiological monitoring of permethrin resistance in human body lice in large-scale clinical studies.


Assuntos
Técnicas de Silenciamento de Genes , Resistência a Inseticidas , Inseticidas/farmacologia , Mutação de Sentido Incorreto , Pediculus/efeitos dos fármacos , Pediculus/genética , Permetrina/farmacologia , Substituição de Aminoácidos , Animais , Genótipo , Pessoas Mal Alojadas , Humanos , Infestações por Piolhos/parasitologia , Testes de Sensibilidade Parasitária/métodos , Parasitologia/métodos , Reação em Cadeia da Polimerase em Tempo Real , Sensibilidade e Especificidade , Canais de Sódio/genética , Temperatura de Transição
14.
Insects ; 13(10)2022 Oct 20.
Artigo em Inglês | MEDLINE | ID: mdl-36292910

RESUMO

Mosquitoes (Diptera: Culicidae) are of significant public health importance because of their ability to transmit major diseases to humans and animals, and are considered as the world's most deadly arthropods. In recent decades, climate change and globalization have promoted mosquito-borne diseases' (MBDs) geographic expansion to new areas, such as North African countries, where some of these MBDs were unusual or even unknown. In this review, we summarize the latest data on mosquito vector species distribution and MBDs affecting both human and animals in North Africa, in order to better understand the risks associated with the introduction of new invasive mosquito species such as Aedes albopictus. Currently, 26 mosquito species confirmed as pathogen vectors occur in North Africa, including Aedes (five species), Culex (eight species), Culiseta (one species) and Anopheles (12 species). These 26 species are involved in the circulation of seven MBDs in North Africa, including two parasitic infections (malaria and filariasis) and five viral infections (WNV, RVF, DENV, SINV and USUV). No bacterial diseases have been reported so far in this area. This review may guide research studies to fill the data gaps, as well as helping with developing effective vector surveillance and controlling strategies by concerned institutions in different involved countries, leading to cooperative and coordinate vector control measures.

15.
Int J Infect Dis ; 117: 15-17, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35108612

RESUMO

Mediterranean spotted fever (MSF) caused by the bacterium Rickettsia conorii is one of the oldest known tick-borne diseases. It is transmitted by the brown dog tick Rhipicephalus sanguineus and occurs mainly in the Mediterranean area. MSF usually presents with a skin rash, high fever, and characteristic eschar at the site of the tick bite. The course of this disease may be benign or life-threatening. Focal neurological manifestations are unusual. We report the case of a patient who presented with an isolated peripheral facial nerve palsy complicating R conorii conorii infection.


Assuntos
Febre Botonosa , Rhipicephalus sanguineus , Rickettsia conorii , Animais , Febre Botonosa/complicações , Febre Botonosa/diagnóstico , Febre Botonosa/tratamento farmacológico , Cães , Nervo Facial , Humanos , Paralisia , Rhipicephalus sanguineus/microbiologia
16.
Comp Immunol Microbiol Infect Dis ; 80: 101726, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-34933167

RESUMO

Hedgehogs are small mammals. They are potential reservoirs of various zoonotic agents. This study was conducted in Bouira, a north-central region of Algeria. A total of 21 Atelerix algirus corpses were picked up on roadsides and gardens. Hedgehog kidneys, spleens and ectoparasites were collected. Twelve hedgehogs were infested with ectoparasites, including Archaeopsylla erinacei, Rhipicephalus sanguineus s.l. and Haemaphysalis erinacei. Hedgehog organs and randomly selected arthropods were screened for microorganisms using molecular methods. Coxiella burnetii was detected in kidneys, spleens, A. erinacei, Hae. erinacei and Rh. sanguineus s.l. Leptospira interrogans was detected in kidneys. Rickettsia felis and Rickettsia massiliae were detected respectively in A. erinacei and in Rh. sanguineus s.l. DNA of an uncultivated Rickettsia spp. was found in Hae. erinacei. Wolbachia spp. DNA was detected in fleas. The DNA of potential new Bartonella and Ehrlichia species were found respectively in fleas and ticks. This study highlights the presence of DNA from a broad range of microorganisms in hedgehogs and their ectoparasites that may be responsible for zoonoses in Algeria.


Assuntos
Artrópodes , Rhipicephalus sanguineus , Sifonápteros , Argélia/epidemiologia , Animais , Ouriços
17.
Sci Rep ; 12(1): 21451, 2022 12 12.
Artigo em Inglês | MEDLINE | ID: mdl-36509808

RESUMO

Tularemia is a zoonosis caused by the bacterium Francisella tularensis. Leporids are primary sources of human infections in the northern hemisphere. Africa is classically considered free of tularemia, but recent data indicate that this dogma might be wrong. We assessed the presence of this disease in wild leporids in Algeria. Between 2014 and 2018, we collected 74 leporids carcasses from spontaneously dead or hunted animals. Francisella tularensis DNA was detected by specific real-time PCR tests in 7/36 (19.44%) Cape hares (Lepus capensis) and 5/38 (13.15%) wild rabbits (Oryctolagus cuniculus). Known tularemia arthropod vectors infested half of the PCR-positive animals. At necropsy, F. tularensis-infected animals presented with an enlarged spleen (n = 12), enlarged adrenal glands (12), liver discoloration (12), hemorrhages (11), and pneumonia (11). Immunohistological examination of liver tissue from one animal was compatible with the presence of F. tularensis. Our study demonstrates the existence of tularemia in lagomorphs in Algeria. It should encourage investigations to detect this disease among the human population of this country.


Assuntos
Francisella tularensis , Lebres , Lagomorpha , Tularemia , Animais , Coelhos , Humanos , Francisella tularensis/genética , Tularemia/diagnóstico , Tularemia/veterinária , Lebres/genética , Zoonoses , Reação em Cadeia da Polimerase em Tempo Real
18.
Microorganisms ; 10(11)2022 Nov 03.
Artigo em Inglês | MEDLINE | ID: mdl-36363770

RESUMO

This study used MALDI-TOF MS and molecular tools to identify tick species infesting camels from Tamanrasset in southern Algeria and to investigate their associated microorganisms. Ninety-one adult ticks were collected from nine camels and were morphologically identified as Hyalomma spp., Hyalomma dromedarii, Hyalomma excavatum, Hyalomma impeltatum and Hyalomma anatolicum. Next, the legs of all ticks were subjected to MALDI-TOF MS, and 88/91 specimens provided good-quality MS spectra. Our homemade MALDI-TOF MS arthropod spectra database was then updated with the new MS spectra of 14 specimens of molecularly confirmed species in this study. The spectra of the remaining tick specimens not included in the MS database were queried against the upgraded database. All 74 specimens were correctly identified by MALDI-TOF MS, with logarithmic score values ranging from 1.701 to 2.507, with median and mean values of 2.199 and 2.172 ± 0.169, respectively. One H. impeltatum and one H. dromedarii (2/91; 2.20%) tested positive by qPCR for Coxiella burnetii, the agent of Q fever. We also report the first detection of an Anaplasma sp. close to A. platys in H. dromedarii in Algeria and a potentially new Ehrlichia sp. in H. impeltatum.

19.
Vet Parasitol Reg Stud Reports ; 31: 100735, 2022 06.
Artigo em Inglês | MEDLINE | ID: mdl-35569916

RESUMO

Vector-borne diseases represent a real threats worldwide, in reason of the lack of vaccine and cure for some diseases. Among arthropod vectors, mosquitoes are described to be the most dangerous animal on earth, resulting in an estimated 725,000 deaths per year due to their borne diseases. Geographical position of Algeria makes this country a high risk area for emerging and re-emerging diseases, such as dengue coming from north (Europe) and malaria from south (Africa). To prevent these threats, rapid and continuous surveillance of mosquito vectors is essential. For this purpose we aimed in this study to create a mosquito vectors locale database using MALDI-TOF mass spectrometry technology for rapid identification of these arthropods. This methodology was validated by testing 211 mosquitoes, including four species (Aedes albopictus, Culex pipiens, Culex quinquefasciatus, and Culiseta longiareolata), in two northern wilayahs of Algeria (Algiers and Bejaia). Species determination by MALDI TOF MS was highly concordant with reference phenotypic and genetic methods. Using this MALDI-TOF MS tool will allow better surveillance of mosquito species able to transmit mosquito borne diseases in Algeria.


Assuntos
Aedes , Culex , Argélia , Animais , Mosquitos Vetores , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz/métodos , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz/veterinária
20.
Viruses ; 14(8)2022 08 17.
Artigo em Inglês | MEDLINE | ID: mdl-36016418

RESUMO

In the last decade, several phleboviruses transmitted by sand flies were detected in the Mediterranean countries, with the health impact of some of them being unknown. From September to October 2020, a total of 3351 sand flies were captured in Kherrata (Bejaia, northern Algeria) and identified by sex, grouped in 62 pools, which were tested for the presence of phlebovirus RNA using endpoint RT-PCR. Two pools (male and female, respectively) were positive. The genome sequencing and phylogenetic analysis showed that the two phleboviruses detected were closely related to the Punique virus (PUNV) isolated in Tunisia and detected in Algeria. Both PUNV strains were isolated on VERO cells from positive pools. Morphological identification of 300 sand flies randomly selected, showed a clear dominance of Phlebotomus perniciosus (98.67%). The dominance of this species in the study area was confirmed by PCR targeting the mitochondrial DNA. Our result represents the first isolation of PUNV and the second report in Algeria from two distinct regions which confirm its large circulation in the country and more broadly in North Africa. Further studies are needed to measure the impact on public health through seroprevalence studies in humans as well as animals and to investigate its potential involvement in neurological viral diseases.


Assuntos
Phlebovirus , Psychodidae , Argélia , Animais , Chlorocebus aethiops , Feminino , Masculino , Phlebovirus/genética , Filogenia , Psychodidae/virologia , Estudos Soroepidemiológicos , Tunísia , Células Vero
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