Is rough strain of Pneumococcus is a pathogen?

Yes, the rough strain of Pneumococcus, specifically Streptococcus pneumoniae, can act as a pathogen. While the smooth strain is typically virulent due to its polysaccharide capsule, the rough variant lacks this capsule and is generally considered less virulent. However, under certain conditions or in immunocompromised individuals, even the rough strain can contribute to disease. Its pathogenic potential may also depend on other factors, such as genetic mutations or co-infections.