http://apnews.myway.com/article/20040330/D81KU69G0.htmlORLANDO, Fla. (AP) - The long sunny days of summer may increase the risk of catching a common sexually transmitted infection. And it's not just because people have more sex when the weather is nice.
Researchers using data from Holland found that detection of papilloma virus infection during routine cancer screening peaks during August. Their theory: Sunlight suppresses women's immune system defenses.
Experts have long suspected that sunlight has powerful - and perhaps conflicting - effects on the body's tendency to develop a variety of diseases, including cancer. The best example is the risk of too much sun triggering skin cancer.
However, many suspect sunshine can have less obvious influences, and can even affect susceptibility to a variety of everyday viruses like papilloma. These viruses are spread through sexual contact, and they are the most common cause of cervical cancer, a disease that kills about 4,000 U.S. women annually. Although the virus can cause genital warts, most infected people have no outward symptoms.
"The sun is a kind of drug, a drug that influences whether a papilloma infection takes hold or not," said Dr. William Hrushesky, an authority on how disease patterns fluctuate over time.