Natural infection with HRSV induces protective immunity which wanes over time -- possibly more so than other respiratory viral infections -- and thus people can be infected multiple times .
Of those infected with RSV , 2 -- 3 % will develop bronchiolitis , necessitating hospitalization .
Natural infection with RSV induces protective immunity which wanes over time -- possibly more so than other respiratory viral infections -- and thus people can be infected multiple times .
Of those infected with RSV , 2 -- 3 % will develop bronchiolitis , necessitating hospitalization .