London: A virus spread during oral sex is the main cause of throat cancer in people under 50 years of age.
Scientists say the human papilloma virus (HPV) spread during unprotected sex is to blame for a disturbing rise in potentially deadly oral cancers in the last few decades.
Doctors have called for boys to be vaccinated against HPV just like teenage girls to stop the spread of the disease.
HPV is also known to cause over 70 percent of cervical cancers. Since 2008, girls aged 12 and 13 have been vaccinated against the virus in schools. However, it can also cause warts and other types of cancers.
Cancers of the mouth and oropharynx - the top of the throat – was common in older men who drank or smoke. But increasingly, it is being diagnosed in younger men also.
Maura Gillison of Ohio State University in Columbus said the sexually transmitted HPV was a graver cause of oral cancers than tobacco.
"According to a Ohio State University statement, it is not known know from strict scientific evidence whether the vaccine will prevent oral HPV infections that lead to cancer," She said..
"Those of us in the field are optimistic it will - the vaccines in every anatomical site looked at so far have been shown to be extraordinarily effective, about 90 percent effective, at preventing infections."
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