Occurrence of influenza B/Hong Kong-Like strains in Brazil, during 2002

Authors

  • Terezinha Maria de Paiva Instituto Adolfo Lutz; Lab. Virus Respiratórios; Serviço de Virologia
  • Maria Akiko Ishida Instituto Adolfo Lutz; Lab. Virus Respiratórios; Serviço de Virologia
  • Maria Gisele Gonçalves Instituto Adolfo Lutz; Lab. Virus Respiratórios; Serviço de Virologia
  • Margareth Aparecida Benega Instituto Adolfo Lutz; Lab. Virus Respiratórios; Serviço de Virologia
  • Maria Candida Oliveira de Souza Instituto Adolfo Lutz; Lab. Virus Respiratórios; Serviço de Virologia
  • Aurea Silveira Cruz Instituto Adolfo Lutz; Lab. Virus Respiratórios; Serviço de Virologia

Keywords:

Influenza virus, Isolation, Identification, Influenza surveillance network, Influenza vaccine

Abstract

Through the influenza virus surveillance from January to October 2002, influenza B/Hong Kong-like strains circulating in the Southeast and Centre East regions of Brazil have been demonstrated. This strain is a variant from B/Victoria/02/88 whose since 1991 and until recently have been isolated relatively infrequently and have been limited to South-Eastern Asia. A total of 510 respiratory secretions were collected from patients 0 to 60 years of age, with acute respiratory illness, living in the Southeast and Centre East regions of Brazil, of which 86 (17.13%) were positive for influenza virus. Among them 12 (13.95%) were characterized as B/Hong Kong/330/2001; 3 (3.49%) as B/Hong Kong/1351/2002 a variant from B/Hong Kong/330/2001; 1 (1.16%) as B/Sichuan/379/99; 1 (1.16%) as B/Shizuoka/5/2001, until now. The percentages of cases notified during the surveillance period were 34.88%, 15.12%, 15.12%, 4.65%, 15.12%, 13.95%, in the age groups of 0-4, 5-10, 11-15, 16-20, 21-30, 31-50, respectively. The highest proportion of isolates was observed among children younger than 4 years but serious morbidity and mortality has not been observed among people older than 65 years, although B influenza virus component for vaccination campaign 2002 was B/Sichuan/379/99 strain. This was probably due to the elderly protection acquired against B/Victoria/02/88. In addition, in influenza A/Panama/2007/99-like (H3N2) strains 22 (25.58%) were also detected, but influenza A(H1N1) has not been detected yet.

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Published

2003-01-01

Issue

Section

Brief Communication

How to Cite

Paiva, T. M. de, Ishida, M. A., Gonçalves, M. G., Benega, M. A., Souza, M. C. O. de, & Cruz, A. S. (2003). Occurrence of influenza B/Hong Kong-Like strains in Brazil, during 2002 . Revista Do Instituto De Medicina Tropical De São Paulo, 45(1), 51-52. https://www.revistas.usp.br/rimtsp/article/view/30671