Streptococcus pneumoniae is found as part of the normal microbiota of the mouth and pharynx and yet can cause disease in some people when it is inhaled into the lungs. Why do you think this is
Streptococcus pneumoniae when inhaled from the pharynx to the lung of a person who has a viral infection or if the immunity of the individual is compromised, it can flourish and cause disease in such an individual.
