<prompt> Answer this question truthfullyWhat is the virulence factor that is commonly found in Streptococcus pneumonia, H. influenzae Type B, and Neisseria spp.?  <response>: <reason> IgA protease is a type of virulence factor that is commonly found in these three bacterial species - Streptococcus pneumonia, H. influenzae Type B, and Neisseria spp. This enzyme is capable of cleaving immunoglobulin A IgA, which is an important component of the bodys immune system, and can help these bacteria evade the hosts immune response. 