An increased flow of migrants crossing into the U.S. has created a number of inquiries about public health implications, Pima County Health Department says.

Over the past two months, as many as more than 4,000 unaccompanied minors from Central America have passed through the temporary processing center in Nogales, Ariz.

Francisco Garcia, director of the department, said there is no cause for concern.

“My assessment is that there is really no or very little threat associated with the unaccompanied children," he said.

Every child who enters the facility receives a full medical screening, which includes a basic check up and skin testing for tuberculosis, pregnancy testing, and a behavioral health assessment. All children are vaccinated against common diseases.

So far, two cases of flu, two cases of chicken pox and a single case of tuberculosis have been reported. Those children were treated for their illnesses.

“Is that more or less than you would expect from any group of 4,000 children?" Garcia said. "Probably not a whole lot different.”

After three days at the processing center, the minors are transferred to temporary shelters – including one on Miracle Mile in Tucson, which as of last Friday, housed 273 migrants.

The Tucson shelter has medical facilities on site. The health department said minors can be treated at local health care facilities only in cases of emergency or when medical needs can't be met at the shelter.