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 : CDC confirms 153 cases of Enterovius D68 in 18 states . California also confirmed four cases of EV-D68 . Canada confirms three cases in British Columbia . Virus worsens breathing problems for children who have asthma .