Hi, Thanks for posting in HCM. I understand your concern. Streptococcal infection is contagious and can spread by air borne route. You can prevent its spread by wearing mask covering nose and oral cavity. Although other family members get exposed to bacteria, not all may develop infection. Some of them in whom there is a risk like decreased immunity would develop infection. Hence, it is better that you get it treated at the earliest. Hope the information provided would be helpful. All the best.