With students back in school, there is a new push for them to get the H1N1 swine flu vaccine.
Local health experts said students who spent time with friends and family over the holidays may have picked up the virus and could be bringing it back to school with them, putting others at risk.
"They have four diagnosed cases in the east that are actually resistant to Tamiflu. If that spreads, the cases that occur, we may not be able to treat them," said Barsky.
Barsky adds that the Tamiflu-resistant strain of influenza may not be vaccine resistant, so the H1N1 vaccine remains the best line of defense.
The Denton County Health Department is holding two free H1N1 vaccination clinics this week. Find out more information here.