Human respiratory syncytial virus in children hospitalized for acute lower respiratory infection

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Diversity and Adaptation of Human Respiratory Syncytial Virus Genotypes Circulating in Two Distinct Communities: Public Hospital and Day Care Center

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Positive selection results in frequent reversible amino acid replacements in the G protein gene of human respiratory syncytial virus

Human respiratory syncytial virus (HRSV) is the major cause of lower respiratory tract infections in children under 5 years of age and the elderly, causing annual disease outbreaks during the fall and winter. Multiple lineages of the HRSVA and HRSVB serotypes co-circulate within a single outbreak and display a strongly temporal pattern of genetic variation, with a replacement of dominant genotypes occurring during consecutive years. In the present study we utilized phylogenetic methods to detect and map sites subject to adaptive evolution in the G protein of HRSVA and HRSVB. A total of 29 and 23 amino acid sites were found to be putatively positively selected in HRSVA and HRSVB, respectively. Several of these sites defined genotypes and lineages within genotypes in both groups, and correlated well with epitopes previously described in group A. Remarkably, 18 of these positively selected tended to revert in time to a previous codon state, producing a flipflop phylogenetic pattern. Such frequent evolutionary reversals in HRSV are indicative of a combination of frequent positive selection, reflecting the changing immune status of the human population, and a limited repertoire of functionally viable amino acids at specific amino acid sites.

Detection of serum antibodies to parainfluenza type 3 virus, respiratory syncytial virus, bovine viral diarrhea virus, and herpes virus type 1 in sheep in the region of Botucatu, São Paulo - Brazil

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Detection of antibodies against bovine respiratory syncytial virus (BRSV) in dairy cattle with different prevalences of bovine herpesvirus type 1 (BoHV-1) in São Paulo State, Brazil

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Expression and purification of human respiratory syncytial virus recombinant fusion protein

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Human respiratory syncytial virus detection in children admitted at a community hospital in Botucatu, SP, Brazil

O Vírus Respiratório Sincicial Humano (VRSH) é descrito como o mais importante patógeno viral causador de doenças respiratórias agudas das vias respiratórias inferiores em crianças. Neste estudo 84 amostras de crianças com idade abaixo dos dois anos apresentando sintomas de doença respiratória aguda, foram obtidas no período de setembro de 2000 a novembro de 2001. Analise por imunofluorescência indireta e transcrição reversa seguida de PCR, revelou que 18% (15/84) das amostras foram positivas, sendo que em 80% (12/15) dos casos a detecção de VRSH foi observada em crianças abaixo dos seis meses, e também que os subgrupos A e B co-circularam. Estes são os primeiros dados obtidos para a cidade de Botucatu, sendo que a sazonalidade mostrou-se evidente pela maior circulação desse vírus entre os meses de maio e julho

Detection of an untyped strain of bovine respiratory syncytial virus in a dairy herd

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Seasonality of viral respiratory infections in Southeast of Brazil: the influence of temperature and air humidity

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Viral etiology among the elderly presenting acute respiratory infection during the influenza season

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Effect of porcine reproductive and respiratory syndrome virus on subsequent Pasteurella multocida challenge in pigs

This trial was conducted to evaluate the effect of Porcine reproductive and respiratory syndrome virus (PRRSv) on a subsequent challenge with Pasteurella multocida in pigs. Sixteen, 3-4 week-old piglets, from a PRRSv and Aujeszky disease virus (ADV) free herd were used. Animals were equally and randomly allocated in four groups which were treated according the following schedule: Group I: negative controls; Group II: inoculation with only PRRSV; Group III: inoculation with PRRSV and P. multocida; Group IV: inoculation with ADV and multocida (positive controls), PRRSV and ADV were inoculated intranasally, at the doses of 10(4.6) and 10(4.5) TCID50/ml, respectively. Five days later, pigs from groups III and IV were inoculated intranasally, with two ml of a 10(9) CFU/mL suspension of equal parts of P. multocida, strains A52 and A24. No lesions were observed in piglets of group I. Microscopically, interstitial pneumonia was identified in all piglets of groups II and III and 3/4 piglets from group IV. Bronchopneumonia was detected in 3/4 of the piglets from group III and in all animals of group TV which, additionally, showed meningo-encephalitis and purulent rhinitis. Macroscopically, only piglets of groups III and IV had lung consolidation. However, much lower pneumonic scores (2.3%) were observed in group III, where 3 of 4 piglets were affected. on the other hand, all piglets of group IV showed some degree of pulmonary consolidation, with a mean score of 13.7%. Based on these results, it appears that the role of PRRSV as a initiator of secondary diseases is still undefined, but is probably mild, There was no clear interaction between PRRSV and Pasteurella multocida under the conditions and strains tested here. (C) 1997 Elsevier B.V. B.V.

Caracterização estrutural e das interações entre a Proteína G do hRSV e potenciais inibidores

Pós-graduação em Microbiologia - IBILCE

Prevalência de vírus respiratórios em crianças de creche com sintomas de infecções respiratórias agudas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Acute respiratory infection and influenza-like illness viral etiologies in Brazilian adults

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Estudo das interações entre proteína NS1 do hRSV e flavonóides utilizando métodos biofísicos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)