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T Helper Cell–Mediated In Vitro Responses of Recently and Remotely Infected Subjects to a Candidate Recombinant Vaccine for Human Parvovirus B19

T cell proliferation to human parvovirus B19 antigen was measured in 6 patients with recent B19 infection (1 with pneumonia and pleuritis), 1 patient with symptoms persisting >180 days after onset, 18 nonsymptomatic subjects with remote B19 immunity, and 12 B19-seronegative control subjects. Reco...

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Bibliographic Details
Published in:The Journal of infectious diseases 2001-03, Vol.183 (5), p.805-809
Main Authors: Franssila, Rauli, Hokynar, Kati, Hedman, Klaus
Format: Article
Language:English
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Summary:T cell proliferation to human parvovirus B19 antigen was measured in 6 patients with recent B19 infection (1 with pneumonia and pleuritis), 1 patient with symptoms persisting >180 days after onset, 18 nonsymptomatic subjects with remote B19 immunity, and 12 B19-seronegative control subjects. Recombinantly expressed virus-like particles (VP1/2 capsids), a candidate B19 vaccine, were used as antigen. Virus-specific T helper cell proliferation was detectable in all the recently infected patients and in most (17/18) of the remotely infected subjects but not in the seronegative control subjects. The B19-specific T cell responses, in general, were most vigorous among the recently infected patients. However, such strong B19-specific proliferation was not confined within the acute phase, as 28% (5/18) of the remotely infected healthy individuals had B19-specific reactivity persisting at acute-phase levels, apparently for years or decades. These data indicate that B cells recognizing the VP1/2 capsids receive class II–restricted help from CD4+ T lymphocytes
ISSN:0022-1899
1537-6613
DOI:10.1086/318819