Data from the Maine Center for Disease Control and Prevention shows a spike in the number of Mainers infected by sexually transmitted diseases.

The Portland Press Herald reports the center's data shows that through April 30, 1,324 residents contracted chlamydia, about 30 percent higher than the five-year median for the first four months of the year.

Chlamydia is on track to nearly match the 3,993 cases in 2015. Gonorrhea had 181 cases through April and is expected to infect nearly 550 people in 2016, surpassing the 422 reported in 2015.

Maine has low rates compared to other states, ranking 49th nationally for chlamydia and 48th for gonorrhea.

A state CDC spokesman says there's no "single reason" for why STDs are on the rise in Maine. (AP)