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Journal of Virology, October 2000, p. 8966-8971, Vol. 74, No. 19
Swiss Institute for Experimental Cancer
Research and the Institute of Biochemistry, University of Lausanne,
CH-1066 Epalinges, Switzerland1;
Laboratoire de Microbiologie INRA, 63122 St.
Genes-Champanelle,2 and Laboratoire de
Virologie et d'Immunologie Moléculaire INRA, C.R.J. Domaine de
Vilvert, 78350 Jouy-en-Josas,4 France; and
Department of Virology, Smyttskyddsinstitutet, Karolinska
Institute, 105 21 Stockholm, Sweden3
Received 6 April 2000/Accepted 13 July 2000
Rotavirus is the major cause of diarrhea among young infants in
both humans and animals. Immune protection of newborns by vaccination is difficult to achieve since there is not enough time to
mount an immune response before exposure to the virus. We have designed
a vaccination strategy mediating transfer of neutralizing antibodies
from the mother to the offspring during pregnancy and/or lactation.
Adult female mice were nasally immunized with virus-like particles
(VLPs) made of viral proteins VP2 and 6 (VLP2/6) or VP 2, 6, and 7 (VLP2/6/7) derived from the RF rotavirus strain in the presence or
absence of cholera toxin. Both vaccines elicited serum and milk
antibodies against the respective VPs. Four days after parturition,
suckling pups were challenged orally with RF rotavirus. Pups from
mothers immunized with VLP2/6/7 but not VLP2/6 were protected against
rotavirus diarrhea, indicating that VP7 plays a key role in protection.
Protection was mediated by milk rather than serum antibodies, and
mucosal adjuvants were not required. In conclusion, VLPs containing VP7
administered nasally to mothers represent a promising vaccine candidate
for the protection of suckling newborns against rotavirus-induced diarrhea, even in the absence of a mucosal adjuvant.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Nasal Immunization of Mice with Virus-Like
Particles Protects Offspring against Rotavirus Diarrhea
*
Corresponding author. Mailing address: ISREC, CH-1066
Epalinges, Switzerland. Phone: (41 21) 692 58 56. Fax: (41 21) 652 69 33. E-mail: Jean-Pierre.Kraehenbuhl{at}isrec.unil.ch.
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