1.   But it is extensive, considering that not many years ago there were almost no cases of invasive strep infection.

2.   For unknown reasons, some people suffer invasive infection, while others remain healthy carriers.

3.   However, Barry noted there is no required reporting of invasive strep infections to city, state or federal health agencies.

4.   Two children suffered dangerous invasive strep infections that required hospitalization.

5.   The vaccine, called Prevnar, prevents invasive pneumococcal infections.