Infectious Diseases, Streptococcus pneumoniae, Pneumococcus, PCV13, Pneumococcal Conjugate Vaccine, PPV23, Pneumococcal polysaccharide vaccine, Serotype 3, Pneumococcal Colonisation, Immunity
TCV, typhoid conjugate vaccine, protection, vaccine effectiveness, medium term, typhoid
vaccine, COVID-19, effectiveness, Nepal, "test-negatuve case-control"