Study of chronic hemolytic anaemia patients in Rio de Janeiro: prevalence of anti-human parvovirus B19 IgG antibodies and the development aplastic crises.

The prevalence of anti-human parvovirus B19 IgG antibodies was determined in sera from 165 chronic hemolytic anemia patients, receiving medical care at Instituto Estadual de Hematologia (IEHE), Rio de Janeiro, during the year of 1994. This sample represents around 10% of the chronic hemolytic anemia patients attending at IEHE. Most of these patients (140) have sickle cell disease. Anti-B19 IgG antibodies were detected in 32.1% of patients. No statistically significant difference (p > 0.05) was seen between IgG antibody prevalence in male (27.8%) and female (35.5%) patients. Anti-B19 IgG antibodies were more frequent in older (37.6%) than younger (28.2%) than 20 years old patients, although this difference had no statistical significance (p > 0.05). Anti-B19 IgG antibody prevalence showed that 67.9% of patients enrolled in the study were susceptible to B19 acute infection. With the aim to detect acute B19 infection, patients follow up continued until February 1996. During this period four patients presented transient aplastic crisis due to human parvovirus B19 as confirmed by the detection of specific IgM antibodies. All four patients were younger than 20 years old, and 3 were younger than 10 years old. Three of them were sickle cell disease patients. Three of the four acute B19 infection occurred during 1994 springtime.

Study of chronic hemolytic anaemia patients in Rio de Janeiro: prevalence of anti-human parvovirus B19 IgG antibodies and the developement of transient aplastic crises

The prevalence of anti-human parvovirus B19 IgG antibodies was determined in sera from 165 chronic hemolytic anemia patients, receiving medical care at Instituto Estadual de Hematologia (IEHE), Rio de Janeiro, during the year of 1994. This sample represents around 10 percent of the chronic hemolytic anemia patients attending at IEHE. Most of these patients (140) have sickle cell disease. Anti-B19 IgG antibodies were detected in 32.1 percent of patients. No statistically significant difference (p > 0.05) was seen between IgG antibody prevalence in male (27.8 percent) and female (35.5 percent) patients. Anti-B19 IgG antibodies were more frequent in older (37.6 percent) than younger (28.2 percent) than 20 years old patients, although this difference had no statistical significance (p > 0.05). Anti-B19 IgG antibody prevalence showed that 67.9 percent of patients enrolled in the study were susceptible to B19 acute infection. With the aim to detect acute B19 infection, patients follow up continued until February 1996. During this period four patients presented transient aplastic crisis due to human parvovirus B19 as confirmed by the detection of specific IgM antibodies. All four patients were younger than 20 years old, and 3 were younger than 10 years old. Three of them were sickle cell disease patients. Three of the four acute B19 infection occurred during 1994 springtime

Infecçäo pelo Parvovírus Canino no Rio de Janeiro: um estudo de cinco anos / Canine parvovirus infection in Rio de Janeiro: a five-year study

Amostras fecais de cäes com até seis meses de idade, com gastrenterite, foram testadas para a presença do parvovírus canino (CPV) pelo teste de hemaglutinaçäo (HA) e confirmadas como positivas pelo teste de inibiçäo da hemaglutinaçäo. Noventa e duas das 208 amostras recebidas no período de abril de 1995 a novembro de 2000 foram positivas. Aproximadamente, 76 por cento das amostras foram obtidas de cäes entre dois e quatro meses de idade. Entre os 92 animais positivos para CPV-2,28 tinham sido vacinados, e para 11 destes o resultado positivo do HA poderia ser devido a detecçäo do vírus vacinal. Através da reaçäo em cadeia pela polimerase, pode-se confirmar a infecçäo pelo vírus selvagem em nove dos 11 animais vacinados. Neste estudo näo foi possível observar que fatores como sexo ou raça possam ser importantes no desenvolvimento da doença. No período estudado, o parvovírus canino pode ser detectado, em todos os meses do ano, näo apresentando sazonalidade definida.