State Department of Public Health staff vaccinated immigrants against chickenpox in order to stop potential outbreaks.
State Health Promotion Coordinator in Mexicali Judith Cordova said about 300 immigrants were vaccinated last week in immigrant shelters.
The authorities expect to vaccinate all minors living in shelters.
Chickenpox is transmitted by ill patients through saliva.
Children of up to one year of age must get the first dose and a booster by age six, as well as those adults who had never been immunized. Cordova said although some immigrants hesitate about being vaccinated after being explained the benefits of vaccination immigrants accept getting the vaccine.