Naturally-occurring serotype 3 Streptococcus pneumoniae strains that lack functional pneumolysin and autolysin have attenuated virulence but induce localized protective immune responses. - Wong, Ηαnnah E.; Tourlomousis, Panagiotis; Paterson, Gavin K.; Webster, Steve; Bryant, Clare E. (PLoS ONE, 2023)