RESUMO
BACKGROUND: PARV4 and human bocavirus (HBoV) are newly discovered human parvoviruses with poorly understood epidemiologies and disease associations. We investigated the frequencies of persistence, tissue distribution, and influence of immunosuppression on replication of these viruses. METHODS: At autopsy, bone marrow, lymphoid tissue, and brain tissue from human immunodeficiency virus (HIV)-infected individuals with acquired immunodeficiency syndrome (AIDS) and those without AIDS and from HIV-uninfected individuals were screened for parvovirus B19, PARV4, and HBoV DNA by means of quantitative polymerase chain reaction analyses. RESULTS: B19 DNA was detected both in HIV-infected study subjects (13 of 24) and in HIV-uninfected study subjects (8 of 8), whereas PARV4 DNA was detected only in HIV-infected study subjects (17 of 24). HBoV DNA was not detected in any study subjects. The degree of immunosuppression with HIV infection did not influence B19 or PARV4 viral loads. B19 or PARV4 plasma viremia was not detected in any study subjects (n=76; viral load <25 DNA copies/mL). A significantly older age distribution was found for study subjects infected with B19 genotype 2, compared with those infected with B19 genotype 1. Two genotypes of PARV4 were detected; study subjects carrying prototype PARV4 (genotype 1) were younger (all born after 1958) than those infected with genotype 2 (PARV5; study subjects born between 1949 and 1956). CONCLUSIONS: Tight immune control of replication of B19 and PARV4 was retained despite profound immunosuppression. Recent genotype replacement of PARV4, combined with absent sequence diversity among genotype 1 sequences, suggests a recent, epidemic spread in the United Kingdom, potentially through transmission routes shared by HIV.
Assuntos
Síndrome da Imunodeficiência Adquirida/complicações , Bocavirus/isolamento & purificação , Infecções por Parvoviridae/epidemiologia , Infecções por Parvoviridae/virologia , Parvoviridae/isolamento & purificação , Distribuição por Idade , Bocavirus/genética , Estudos de Casos e Controles , Primers do DNA , DNA Viral/análise , Inglaterra/epidemiologia , Humanos , Hospedeiro Imunocomprometido , Parvoviridae/classificação , Parvoviridae/genética , Infecções por Parvoviridae/sangue , Infecções por Parvoviridae/complicações , Parvovirus B19 Humano/genética , Parvovirus B19 Humano/isolamento & purificação , Reação em Cadeia da Polimerase , Carga ViralRESUMO
Transmission routes of PARV4, a newly discovered human parvovirus, were investigated by determining frequencies of persistent infections using autopsy samples from different risk groups. Predominantly parenteral routes of transmission were demonstrated by infection restricted to injection drug users and persons with hemophilia and absence of infection in homosexual men with AIDS and low-risk controls.
