The CDC estimates that 10 million to 15 million infections occur in the United States each year . NEW : Virus confirms 18 cases of Enterovius D68 in 18 states . Canada also confirmed four cases of EV-D68 . British Columbia confirms three cases in California . Virus worsens breathing problems for children who have asthma .
NEW : Virus confirms 18 cases of Enterovius D68 in 18 states . Canada also confirmed four cases of EV-D68 . British Columbia confirms three cases in California . Virus worsens breathing problems for children who have asthma .