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J. Virol., Jan 1998, 330-338, Vol 72, No. 1
L Yuan, SY Kang, LA Ward, TL To and LJ Saif
Newborn gnotobiotic pigs were inoculated twice perorally (p.o.) (group 1)
or intramuscularly (i.m.) (group 2) or three times i.m. (group 3) with
inactivated Wa strain human rotavirus and challenged with virulent Wa human
rotavirus 20 to 24 days later. To assess correlates of protection,
antibody-secreting cells (ASC) were enumerated in intestinal and systemic
lymphoid tissues from pigs in each group at selected postinoculation days
(PID) or postchallenge days. Few virus- specific ASC were detected in any
tissues of group 1 pigs prior to challenge. By comparison, groups 2 and 3
had significantly greater numbers of virus-specific immunoglobulin M (IgM)
ASC in intestinal and splenic tissues at PID 8 and significantly greater
numbers of virus- specific IgG ASC and IgG memory B cells in spleen and
blood at challenge. However, as for group 1, few virus-specific IgA ASC or
IgA memory B cells were detected in any tissues of group 2 and 3 pigs.
Neither p.o. nor i.m. inoculation conferred significant protection against
virulent Wa rotavirus challenge (0 to 6% protection rate), and all groups
showed significant anamnestic virus-specific IgG and IgA ASC responses.
Hence, high numbers of IgG ASC or memory IgG ASC in the systemic lymphoid
tissues at the time of challenge did not correlate with protection.
Further, our findings suggest that inactivated Wa human rotavirus
administered either p.o. or parenterally is significantly less effective in
inducing intestinal IgA ASC responses and conferring protective immunity
than live Wa human rotavirus inoculated orally, as reported earlier (L.
Yuan, L. A. Ward, B. I. Rosen, T. L. To, and L. J. Saif, J. Virol.
70:3075-3083, 1996). Thus, more efficient mucosal delivery systems and
rotavirus vaccination strategies are needed to induce intestinal IgA ASC
responses, identified previously as a correlate of protective immunity to
rotavirus.
Copyright © 1998, American Society for Microbiology
Antibody-secreting cell responses and protective immunity assessed in gnotobiotic pigs inoculated orally or intramuscularly with inactivated human rotavirus
Department of Veterinary Preventive Medicine, Ohio Agriculture Research and Development Center, The Ohio State University, Wooster 44691-4096, USA.
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