Résumé
Influenza surveillance networks in Guangdong were established to investigate the epidemiological characteristics of influenza and influenza epidemics. Influenza activity peaked annually from March to July in Guangdong in 1991-2000; influenza H3N2 predominated in the epidemic (7 years of 10); the outbreak of influenza in 1996 was the remarkable result of antigenic drift of H3N2 strain. Ten isolates of H9N2 strains were discovered from human subjects in 1998 and 1999: chicken strains isolated after the Hong Kong fowl influenza outbreak. It was found that there was just one influenza activity season per annum in Guangdong and that the influenza H3N2 subtype still predominates in Guangdong. Further research into the pathogenicity of influenza H9N2 in humans warranted.
Sujets)
Animaux , Chine/épidémiologie , Notification des maladies , Épidémies de maladies , Humains , Virus de la grippe A/isolement et purification , Grippe humaine/épidémiologie , Surveillance de la populationRésumé
The statistical analysis of six indices: sex, age, occupation, time of onset, mode of infection and educational level of acute cases infected by Schistosoma japonicum in 1990 and 1994 respectively in Wuhu city was carried out. No significant differences were found in the five indices between 1990 and 1994 in Wuhu city except sex. There were significant differences between the urban and rural areas in all six indices.