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1.
Parasit Vectors ; 11(1): 553, 2018 Oct 23.
Artigo em Inglês | MEDLINE | ID: mdl-30352609

RESUMO

BACKGROUND: Identification of vectors is of prime importance in the field of medical entomology for both operational and research purposes. An external quality assessment of mosquito identification capacities was carried out within the MediLabSecure Network, which is composed of laboratories located in 19 countries close to the European Union around the Mediterranean and Black seas. METHODS: A set of blind samples consisting of 7 or 8 adult mosquitoes and 4 larvae was given to each participant laboratory. In all, 138 adult mosquitoes and 76 larvae of different species were distributed for genus and species identification. RESULTS: All identifications were exclusively morphology based. Overall, 81% of identifications were correct at the genus level, 64% at the species level. The results were highly varied among the 19 participating laboratories. The levels of correct identifications were: 100% (three laboratories), 90-95% (four laboratories), 50-75% (six laboratories) and < 50% (six laboratories). CONCLUSIONS: This evaluation showed the need to maintain efforts in capacity building and quality control in the field of medical entomology and, more specifically, in the morphological identification of the Culicidae.


Assuntos
Culicidae/classificação , Animais , Feminino , Laboratórios/normas , Masculino , Controle de Qualidade
2.
Folia Med (Plovdiv) ; 57(2): 104-10, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-26933779

RESUMO

UNLABELLED: Early diagnosis and treatment of patients with influenza is the reason why physicians need rapid high-sensitivity influenza diagnostic tests that require no complex lab equipment and can be performed and interpreted within 15 min. The Aim of this study was to compare the rapid Directigen Flu A+B test with real time PCR for detection of influenza viruses in the Republic of Macedonia. MATERIALS AND METHODS: One-hundred-eight respiratory samples (combined nose and throat swabs) were routinely collected for detection of influenza virus during influenza seasons. Forty-one patients were pediatric cases and 59 were adult. Their mean age was 23 years. The patients were allocated into 6 age groups: 0-4 yrs, 5-9 yrs, 10-14 yrs, 15-19 yrs, 20-64 yrs and > 65 yrs. Each sample was tested with Directigen Flu A+B and CDC real time PCR kit for detection and typisation/subtypisation of influenza according to the lab diagnostic protocol. RESULTS: Directigen Flu A+B identified influenza A virus in 20 (18.5%) samples and influenza B virus in two 2 (1.9%) samples. The high specificity (100%) and PPV of Directigen Flu A+B we found in our study shows that the positive results do not need to be confirmed. The overall sensitivity of Directigen Flu A+B is 35.1% for influenza A virus and 33.0% for influenza B virus. The sensitivity for influenza A is higher among children hospitalized (45.0%) and outpatients (40.0%) versus adults. CONCLUSION: Directigen Flu A+B has relatively low sensitivity for detection of influenza viruses in combined nose and throat swabs. Negative results must be confirmed.


Assuntos
Vírus da Influenza A/isolamento & purificação , Vírus da Influenza B/isolamento & purificação , Influenza Humana/diagnóstico , Reação em Cadeia da Polimerase em Tempo Real/métodos , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Criança , Pré-Escolar , Humanos , Lactente , Recém-Nascido , Vírus da Influenza A/genética , Vírus da Influenza B/genética , Pessoa de Meia-Idade , Sensibilidade e Especificidade
3.
Artigo em Inglês | MEDLINE | ID: mdl-25500672

RESUMO

THE AIM: To present and compare different Nucleic Acid Testing assays used for laboratory diagnosis of influenza virus infection in our country. MATERIALS AND METHODS: Respiratory samples used were nose and throat swabs. The RNA extraction was performed with a QIAamp viral RNA kit. During the season 2009­2010 the first 25 samples were tested with: conventional gel-based RT-PCR and CDC rtRT-PCR using published specific matrix and HA gene primers and probes for influenza virus typing and subtyping. RESULTS: Of 25 samples tested with conventional RT-PCR 7(28%) were positive for influenza A, but negative for A/H1seasonal and A/H3. Retested with rtRT-PCR 9(36%) were positive for influenza A, 8(32%) were positive for А/H1pdm and 1(4%) was А/H3. Two samples positive with rtRT-PCR for influenza A were negative with RT-PCR. The sensitivity of the RT-PCR in comparison with rtRT-PCR is 100% and the specificity is 88.89%. Positive predictive value for RT-PCR is 77.78%, and negative predictive value is 100%. RT-PCR is a four-step and rtRT-PCR a one-step procedure. The turn-around time of RT-PCR is 6 hours and for rtRT-PCR it is 2 hours. DISCUSSION AND CONCLUSION: For surveillance purposes nose and throat swabs are the more easy and practical to collect. It was proved that RT-PCR is too laborious, multi-step and time-consuming. The sensitivity of both assays is equal. The specificity of rtRT-PCR is higher. NAT assays for detection of influenza viruses have become an integral component of the surveillance programme in our country. They provide a fast, accurate and sensitive detection of influenza.


Assuntos
Influenza Humana/diagnóstico , Reação em Cadeia da Polimerase em Tempo Real/métodos , Reação em Cadeia da Polimerase Via Transcriptase Reversa/métodos , Humanos , Técnicas de Amplificação de Ácido Nucleico , Valor Preditivo dos Testes , RNA Viral/análise , Sensibilidade e Especificidade , Fatores de Tempo
4.
Artigo em Inglês | MEDLINE | ID: mdl-24285353

RESUMO

OBJECTIVE: To provide virological and epidemiological information on patients laboratory-tested for influenza A/ H1N1pdm during the pandemic season April 2009/May 2010. MATERIALS AND METHODS: Demographic and other data were obtained from the request form arriving with the samples of patients whose symptoms met the clinical definition of influenza A infection. The RNA was tested for the presence of influenza virus using the CDC real-time RT-PCR assay. A total of 3010 suspect patients (pts) were tested from week 18 2009 to week 20 2010. RESULTS: 1632 pts (54.2%) were oositive for influenza. From them 1556 samples were confirmed as H1N1pdm. There was a domination of H1N1pdm positivity among young persons in age groups 5-17 (34.4%) and 18-49 (31.4%) years. The pandemic influenza was presented in two waves. The first wave started on 20 June with the first positive case and peaked early in August (week 32). The second wave started from week 44. The majority of positive cases were between week 45 and week 52. 37.7% of the positive pts were hospitalized--66.7% of pts at age 65+ and 63.3% of children in the age group 0-4 years. The highest percentage of patients with underlying medical conditions were in the age group 50-64 (49.35%) years and 65+ (88.23%) years. 1.15% of the positive pts for H1N1pdm gave data for vaccination with seasonal influenza. CONCLUSIONS: Data obtained from laboratory and epidemiological surveillance of pandemic influenza will serve public health to a full understanding of the pandemic 2009/2010 influenza in R. Macedonia and dealing with future challenges.


Assuntos
Técnicas de Laboratório Clínico , Vírus da Influenza A Subtipo H1N1/isolamento & purificação , Influenza Humana/epidemiologia , Influenza Humana/virologia , Pandemias , Adolescente , Adulto , Idoso , Criança , Pré-Escolar , Feminino , Hospitalização , Humanos , Lactente , Recém-Nascido , Vírus da Influenza A Subtipo H1N1/genética , Vacinas contra Influenza/administração & dosagem , Influenza Humana/diagnóstico , Influenza Humana/prevenção & controle , Masculino , Pessoa de Meia-Idade , Pandemias/prevenção & controle , Vigilância da População , Valor Preditivo dos Testes , RNA Viral/genética , RNA Viral/isolamento & purificação , Reação em Cadeia da Polimerase em Tempo Real , Estações do Ano , Fatores de Tempo , Vacinação , Adulto Jovem
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