An E. coli outbreak may be ongoing in Montgomery and Fulton Counties in New York.

The State Health Department has confirmed that three children have tested positive for E. coli, and one has been hospitalized. Two of the children attend the same daycare, but officials are not releasing the name of that facility yet, according to WTEN TV.

It is not known how the third child became ill, but health officials say they are performing tests on some of the children attending the daycare program.

During summer months, exposure at pools and water parks has been linked to outbreaks of E. coli, Cryptosporidium, and other bacteria, parasites, and viruses.  Recently, several children became ill with E. coli infections after attending a back yard water slide party near Bakersfield, California.  In 2004, thousands of people became ill with Cryptosporidiosis after exposure to Cryptosporidium at the Seneca Lake Spraypark near Geneva, New York, and in 1998 dozens of children became ill with E. coli O157:H7 infections, including seven children who were hospitalized and one child who died, after playing in a kiddie pool at the White Water waterpark near Atlanta, Georgia.