Development of Acquired Immunity Following Repeated Respiratory Syncytial Virus Infections in Cotton Rats

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2016 May 26

PMID 27224021

Citations 10

Authors

Yoshiaki Yamaji

Yosuke Yasui

Tetsuo Nakayama

Affiliations

Soon will be listed here.

Abstract

Respiratory syncytial virus (RSV) infections occur every year worldwide. Most infants are infected with RSV by one year of age and are reinfected because immune responses after the first infection are too weak to protect against subsequent infections. In the present study, immune responses against RSV were investigated in order to obtain a better understanding of repetitive RSV infections in cotton rats. No detectable neutralizing antibody (NT) was developed after the first infection, and the second infection was not prevented. The results of histological examinations revealed severe inflammation, viral antigens were detected around bronchial epithelial cells, and infectious viruses were recovered from lung homogenates. Following the second infection neutralizing antibodies were significantly elevated, and CD8+ cells were activated in response to RSV-F253-265. No viral antigens was detected thereafter in lung tissues and infectious viruses were not recovered. Similar results were obtained in the present study using the subgroups A and B. These results support the induction of humoral and cellular immune responses following repetitive infections with RSV; however, these responses were insufficient to eliminate viruses in the first and second infections.

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