Background In May, 1997, a 3-year-old boy in Hong Kong was admitted to the hospital and subsequently died from influenza pneumonia, acute respiratory distress syndrome, Reye's syndrome, multiorgan failure, and disseminated intravascular coagulation.
An influenza A H5N1 virus was isolated from a tracheal aspirate of the boy.
Preceding this incident, avian influenza outbreaks of high mortality were reported from three chicken farms in Hong Kong, and the virus involved was also found to be of the H5 subtype.
Methods We carried out an antigenic and molecular comparison of the influenza A H5N1 virus isolated from the boy with one of the viruses isolated from outbreaks of avian influenza by haemagglutination-inhibition and neuraminidase-inhibition assays and nucleotide sequence analysis.
Findings Differences were observed in the antigenic reactivities of the viruses by the haemagglutination-inhibition assay.
However, nucleotide sequence analysis of all gene segments revealed that the human virus A/Hong Kong/156/97 was genetically closely related to the avian A/chicken/Hong Kong/258/97. interpretation Although direct contact between the sick child and affected chickens has not been established, our results suggest transmission of the virus from infected chickens to the child without another intermediate mammalian host acting as a « mixing vessel ».
This event illustrates the importance of intensive global influenza surveillance.
Mots-clés Pascal : Influenzavirus aviaire, Influenzavirus A, Orthomyxoviridae, Virus, Epidémiologie, Corrélation, Virus grippal A, Profil bande spectrale, Exploration virologique, Prévention, Homme, Virose, Infection, Virus Influenza A H5N1
Mots-clés Pascal anglais : Avian influenzavirus, Influenzavirus A, Orthomyxoviridae, Virus, Epidemiology, Correlation, Influenza A virus, Spectral band profile, Virological exploration, Prevention, Human, Viral disease, Infection
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0123492
Code Inist : 002B05C02J. Création : 22/06/1998.