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Influenza virus and proteolytic bacteria co-infection in respiratory tract from individuals presenting respiratory manifestations

A role for proteolytic bacteria in the exacerbation of influenza virus has been shown in natural hosts such as pigs and humans. Four hundred seven samples were collected from the respiratory tract of individuals presenting clinical manifestations, during influenza season (2003-2005) in São Paulo Cit...

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Published in:Revista do Instituto de Medicina Tropical de São Paulo 2008-01, Vol.50 (1), p.41-46
Main Authors: Mancini, Dalva Assunção Portari, Alves, Rosely C Barbosa, Mendonça, Rita Maria Zucatelli, Bellei, Nancy J, Carraro, Emerson, Machado, Antonia M O, Pinto, José Ricardo, Mancini Filho, Jorge
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creator Mancini, Dalva Assunção Portari
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description A role for proteolytic bacteria in the exacerbation of influenza virus has been shown in natural hosts such as pigs and humans. Four hundred seven samples were collected from the respiratory tract of individuals presenting clinical manifestations, during influenza season (2003-2005) in São Paulo City. The aim of this study was to evaluate the incidence of determined bacteria co-infecting virus in human respiratory tract. Tests, such as bacteriological, immunofluorescence (IF), RT/PCR and hemagglutination (HA) were used for bacterial and viral investigation. Thirty seven (9.09%) positive for influenza virus were screened by IF. The RT/PCR confirmed the presence of influenza virus in these samples. Bacterial and agar casein tests demonstrated that 18 (48.64%) individuals were infected with proteolytic bacteria such as Staphylococcus spp., Streptococcus spp. and Pseudomonas spp. Among these samples, 13 (35.13%) were co-infected with influenza A virus. Influenza type B, co-infecting bacteria were found in five (13.51%) samples. In vitro the S. aureus protease increased the influenza HA titer after contact for 30 min at 25 masculineC. Results revealed the occurrence of co-infection with proteolytic bacteria and influenza in the evaluated individuals. This finding corroborates that virus versus bacteria synergism could be able to potentiate respiratory infection, increasing damage to hosts.
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Four hundred seven samples were collected from the respiratory tract of individuals presenting clinical manifestations, during influenza season (2003-2005) in São Paulo City. The aim of this study was to evaluate the incidence of determined bacteria co-infecting virus in human respiratory tract. Tests, such as bacteriological, immunofluorescence (IF), RT/PCR and hemagglutination (HA) were used for bacterial and viral investigation. Thirty seven (9.09%) positive for influenza virus were screened by IF. The RT/PCR confirmed the presence of influenza virus in these samples. Bacterial and agar casein tests demonstrated that 18 (48.64%) individuals were infected with proteolytic bacteria such as Staphylococcus spp., Streptococcus spp. and Pseudomonas spp. Among these samples, 13 (35.13%) were co-infected with influenza A virus. Influenza type B, co-infecting bacteria were found in five (13.51%) samples. 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subjects Adolescent
Adult
Bacterial Infections - complications
Bacterial Infections - microbiology
Child
Fluorescent Antibody Technique
Hemagglutination
Humans
Influenza A virus - genetics
Influenza A virus - isolation & purification
Influenza B virus - genetics
Influenza B virus - isolation & purification
Influenza, Human - complications
Influenza, Human - microbiology
Influenza, Human - virology
Pseudomonas - enzymology
Pseudomonas - genetics
Pseudomonas - isolation & purification
Reverse Transcriptase Polymerase Chain Reaction
RNA, Viral - analysis
Staphylococcus - enzymology
Staphylococcus - genetics
Staphylococcus - isolation & purification
Streptococcus - enzymology
Streptococcus - genetics
Streptococcus - isolation & purification
TROPICAL MEDICINE
Virus Activation
title Influenza virus and proteolytic bacteria co-infection in respiratory tract from individuals presenting respiratory manifestations
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