A household cluster of fulminant group A streptococcus pneumonia associated with toxic shock syndrome-Quebec.

In the last few years, serious cases of group A streptococcus (GAS) invasive infections have been increasing worldwide. Many questions related to this entity remain unanswered, especially those of secondary cases in close contact with an index patient. Household clusters have been described but are not numerous, and no study has yet clearly established the risk of acquiring the infection in this particular population. It is well known that GAS has the ability to spread from infected patients to close contacts, but this usually involves patients with pharyngitis and sometimes impetigo.