Classification of IBV S1 genotypes by direct reverse transcriptase-polymerase chain reaction (RT-PCR) and relationship between serotypes and genotypes of strains isolated between 1998 and 2008 in Japan.

In this study, we attempted to establish a simple detection method for classification of IBV S1 genotypes by direct reverse transcriptase-polymerase chain reaction (RT-PCR). Then, to evaluate the usefulness of the S1 genotype-specific RT-PCR, we examined the relationship between S1 genotypes and serotypes of IBV in Japan. Sequencing of the S1 genes of IBV and phylogenetic tree analysis were conducted.

Sequential immunization with V3 peptides from primary human immunodeficiency virus type 1 produces cross-neutralizing antibodies against primary isolates with a matching narrow-neutralization sequence motif.

An antibody response capable of neutralizing not only homologous but also heterologous forms of the CXCR4-tropic human immunodeficiency virus type 1 (HIV-1) MNp and CCR5-tropic primary isolate HIV-1 JR-CSF was achieved through sequential immunization with a combination of synthetic peptides representing HIV-1 Env V3 sequences from field and laboratory HIV-1 clade B isolates. In contrast, repeated immunization with a single V3 peptide generated antibodies that neutralized only type-specific laboratory-adapted homologous viruses. To determine whether the cross-neutralization response could be attributed to a cross-reactive antibody in the immunized animals, we isolated a monoclonal antibody, C25, which neutralized the heterologous primary viruses of HIV-1 clade B.

Pre-exposure treatment of cats with anti-FHV-1 and anti-FCV mouse-cat chimeric antibodies.

Prior to pre-exposure treatment of cats with two mouse-cat chimeric antibodies, FJH2 and F1D7, having neutralizing activity to feline herpesvirus-1 (FHV-1) and cat calicivirus (FCV), respectively, these chimeric antibodies were labeled with (125)I and administered to cats to examine their blood kinetics. Concentrations of the both administered chimeric antibodies in the blood reached maximum at the 48th hour post-administration, and the level was 34% for FJH2 and 54% for F1D7. Then the concentration levels declined gently, and decreased afterwards to 8.

Post-exposure treatment of cats with mouse-cat chimeric antibodies against feline herpesvirus type 1 and feline calicivirus.

In order to confirm the in vivo effectiveness of anti- feline herpesvirus type 1 (FHV-1) mouse-cat chimeric antibody (FJH2), and anti-feline calicivirus (FCV) mouse-cat chimeric antibody (F1D7), cats that had been experimentally infected with FHV-1 or FCV were administered intravenously with the chimeric antibodies, and observed for clinical manifestations. The symptoms due to FHV-1 or FCV infection in the cats administered FJH2 or F1D7 were obviously decreased when compared with those of the non-administered control cats. From these results, it was confirmed that both FJH2 and F1D7 were effective at reducing the appearance of symptoms due to FHV-1 and FCV infection, respectively.