The sexual health of Madison County residents may be faring better than those in the rest of the nation, according to a report by the Indiana State Department of Health.

In 2005, only 400 cases of sexually transmitted diseases were recorded. Statewide, 30,000 cases were reported throughout the entire state in 2007. This is compared to a recent study by the Center for Disease Control and Prevention which found alarming statistics nationwide.

At least one in four teenage girls nationwide has a sexually transmitted disease, or more than 3 million teens, according to the first study of its kind in this age group.

A virus that causes cervical cancer is by far the most common sexually transmitted infection in teen girls aged 14 to 19, while the highest overall prevalence is among black girls — nearly half the blacks studied had at least one STD. That rate compared with 20 percent among both whites and Mexican-American teens, the study from the federal Centers for Disease Control and Prevention found.

About half of the girls acknowledged ever having sex; among them, the rate was 40 percent. While some teens define sex as only intercourse, other types of intimate behavior including oral sex can spread some infections.

For many, the numbers likely seem “overwhelming because you’re talking about nearly half of the sexually experienced teens at any one time having evidence of an STD,” said Dr. Margaret Blythe, an adolescent medicine specialist at Indiana University School of Medicine and head of the American Academy of Pediatrics’ committee on adolescence.

But the study highlights what many doctors who treat teens see every day, Blythe said.

Dr. John Douglas, director of the CDC’s division of STD prevention, said the results are the first to examine the combined national prevalence of common sexually transmitted diseases among adolescent girls. He said the data, from 2003-04, likely reflect current rates of infection.

“High STD rates among young women, particularly African-American young women, are clear signs that we must continue developing ways to reach those most at risk,” Douglas said.

The CDC’s Dr. Kevin Fenton said given that STDs can cause infertility and cervical cancer in women, “screening, vaccination and other prevention strategies for sexually active women are among our highest public health priorities.”

The study by CDC researcher Dr. Sara Forhan is an analysis of nationally representative data on 838 girls who participated in a 2003-04 government health survey. Teens were tested for four infections: human papillomavirus, or HPV, which can cause cervical cancer and affected 18 percent of girls studied; chlamydia, which affected 4 percent; trichomoniasis, 2.5 percent; and herpes simplex virus, 2 percent.

Blythe said the results are similar to previous studies examining rates of those diseases individually.

The results were prepared for release Tuesday at a CDC conference in Chicago on preventing sexually transmitted diseases.

HPV can cause genital warts but often has no symptoms. A vaccine targeting several HPV strains recently became available, but Douglas said it likely has not yet had much impact on HPV prevalence rates in teen girls.

Chlamydia and trichomoniasis can be treated with antibiotics. The CDC recommends annual chlamydia screening for all sexually active women under age 25. It also recommends the three-dose HPV vaccine for girls aged 11-12 years, and catch-up shots for females aged 13 to 26.

The American Academy of Pediatrics has similar recommendations.

Douglas said screening tests are underused in part because many teens don’t think they’re at risk, but also, some doctors mistakenly think, ’“Sexually transmitted diseases don’t happen to the kinds of patients I see.”’

Blythe said some doctors also are reluctant to discuss STDs with teen patients or offer screening because of confidentiality concerns, knowing parents would have to be told of the results.

The American Academy of Pediatrics supports confidential teen screening, she said.

Betty Cochrum, president of Planned Parenthood of Indiana, explained that the recent rise in STDs is no surprise. “ A recent CDC report issued in December said that the teen birth rate is up for the first time since 1991 and so it’s no surprise that the CDC is now issuing a report that more than 3 million teen girls have an STI [sexually transmitted infection].”

Sexual activity in teens may not be producing noteworthy STD statistics but Cochrum says teens are suffering from the consequences of unprotected sex. “Here in indiana, we have 31 teenagers getting pregnant each and every day.”

In order to prevent the spread of HPV, Planned Parenthood is offering a vaccine called Gardisil. “We are now offering it at 9 of our 35 locations across the state.” For those living in Madison County, the nearest location is at the Planned Parenthood center in Castleton. The organization is urging all sexually active adults and teens to be vaccinated regardless of cost. “There is a three shot series and it is expensive but we have a women’s health fund that can help cover that cost and there are two other sources of assistance we could use. My message would be ‘please, please come in. We’re pretty confident that we can meet the need and deal with financial challenges,” Cochrum said.

Staff Reporter Brandi Watters contributed to this report.