RESUMO
BACKGROUND: Dengue virus causes the dengue fever as well as hemorrhagic fever in tropical and sub-tropical countries. It is now endemic in most parts of the South East Asia. Full-genome information of dengue virus 3 is not available from Yemen. METHODS: In this study, the dengue virus 3 was detected by diagnostic tools like serology and RT-PCR in the samples isolated from a patient in Yemen. The full-genome was sequenced, and the identity, phylogenetic relationship and recombination analysis was performed by using BioEdit, MEGA X and RDP4 softwares. RESULTS: The full-genome of the Yemen isolate was found to be 10,643 nt long with 3390 amino acids. The Yemen dengue virus 3 isolate showed the sequence similarity (98.5-92.4%) with dengue virus 3 isolates from China, Pakistan, India and Bangladesh respectively. The significant non-synonymous substitutions of amino acid in Yemen isolate were observed with selected isolates. The phylogenetic tree of Yemen isolate formed a unique clade within genotype III and sub-clade into lineage III. The Dengue virus isolate from Jeddah formed separated cluster with lineage IV. CONCLUSIONS: This reveals the unique genetic variability among DENV-3 serotypes from Jeddah and earlier reported isolates from other regions.
Assuntos
Vírus da Dengue , Dengue , Bangladesh , China , Dengue/epidemiologia , Vírus da Dengue/genética , Genótipo , Humanos , Índia , Paquistão , Filogenia , RNA Viral/genética , Sorogrupo , Iêmen/epidemiologiaRESUMO
We investigated the survival of a pandemic strain of influenza A H1N1 on a variety of common household surfaces where multiple samples were taken from 4 types of common household fomite at 7 time points. Results showed that influenza A H1N1sw virus particles remained infectious for 48 hours on a wooden surface, for 24 hours on stainless steel and plastic surfaces, and for 8 hours on a cloth surface, although virus recovery from the cloth may have been suboptimal. Our results suggest that pandemic influenza A H1N1 can survive on common household fomites for extended periods of time, and that good hand hygiene and regular disinfection of commonly touched surfaces should be practiced during the influenza season to help reduce transmission.
Assuntos
Microbiologia Ambiental , Características da Família , Fômites/virologia , Vírus da Influenza A Subtipo H1N1/isolamento & purificação , Vírus da Influenza A Subtipo H1N1/fisiologia , Viabilidade Microbiana , Humanos , Fatores de TempoRESUMO
An unusual case of malaria presented with gastroenteritis and bloody diarrhoea in a 46-year-old male. The patient was a non-Saudi resident of Makkah, Saudi Arabia. Fever was not the presenting complaint, and the patient had not experienced any chills or sweating. He gave history of recent travel to Pakistan. Initial laboratory investigations showed anemia, thrombocytopenia, normal liver function, and negative blood film for malaria. His widal, Brucella, and dengue serology was negative. Endoscopic examination showed gastroenteritis. On the fifth day of admission, a sexual form of Plasmodium falciparum on peripheral smear was reported by chance. Malaria was misdiagnosed because of initial negative blood film which may have been due to false microscopy or a long period between exposures and positive blood film. We concluded that a repeat blood film for malaria at 12- to 24-hour intervals for 48 to 72 hours is cost effective when a patient has recently travelled to an endemic area.
