Genetic homogeneity of measles viruses associated with a measles outbreak, São Paulo, Brazil, 1997.
During a resurgence of measles in São Paulo, Brazil, in 1997, >40,000 cases (peak incidence rate of 246/100,000 inhabitants) and 42 measles-related deaths were reported. Reverse transcriptase-polymerase chain reaction and nucleotide sequencing were used to analyze specimens from patients who had typical clinical measles infection during this outbreak and from six patients who had had measles in 1995 and 1996. Although wild-type measles viruses (genotypes D5 and D6) were present in São Paulo before this resurgence, we detected only D6 viruses. The genotype D6 viruses isolated during this outbreak had identical sequences to genotype D6 viruses isolated in other parts of Brazil and South America in 1997 and 1998, suggesting that a single chain of transmission was responsible. We also identified genotype A viruses in two vaccine-associated cases from 1995 and 1996. Our findings extend the knowledge of the circulation patterns of measles virus in South America, contributing to measles control efforts in the Americas.
Adolfo Lutz Institute, São Paulo, Brazil.
Maria I
MI
Oliveira
Paul A
PA
Rota
Suely P
SP
Curti
Cristina A
CA
Figueiredo
Ana M S
AM
Afonso
Marcia
M
Theobaldo
Luiza T M
LT
Souza
Stephanie L
SL
Liffick
William J
WJ
Bellini
Jose C
JC
Moraes
Klaus E
KE
Stevien
Edison L
EL
Durigon
D001938:Brazil / Q000453:epidemiology; D004196:Disease Outbreaks; D014644:Genetic Variation; D016679:Genome, Viral; D005838:Genotype; D006801:Humans; D008457:Measles / Q000453:epidemiology* / Q000821:virology*; D008459:Measles virus / Q000235:genetics* / Q000302:isolation & purification; D017720:Molecular Epidemiology; D010802:Phylogeny; D012367:RNA, Viral / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction
D012367:RNA, Viral