(healthy children (non-infants) and adults with intact, fully functional immune systems and
previous exposure to these parasites). Low–medium risk group (healthy children (non-infants)
and adults with intact, fully functional immune systems and no previous exposure to these
parasites). Medium–high risk group (infants, elderly, pregnant, other dslightlyT
immunocompromised groups—may or may not have been previously exposed to these parasites).
High risk group (seriously immunocompromised (e.g. AIDS patients, transplant patients, etc.)
with no previous exposure to these parasites)