A record-breaking rise in potentially fatal infections in Japan is bringing attention to persistent, unanswered questions about the group of bacteria behind the illnesses. The rare infection, streptococcal toxic shock syndrome , is caused by Group A strep bacteria, the same type that causes strep throat and scarlet fever. In rare cases, Group A strep can enter deep tissue or the bloodstream, as is the case with STSS.
He added: “Most of these infections were really profoundly reduced during Covid because we stayed at home and wore masks and closed schools and the like.” However, other viral illnesses that surged as lockdowns eased and socializing resumed have seemingly returned to their baselines, whereas strep cases continue to surpass the usual averages, experts said. “Any number of infections have come back to normal, conventional levels — but strep has exceeded them.