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admin 16.06.2015

Although many people don't know it, kissing can give you herpes, and this can be caused by either Herpes Simplex Virus type 1 (HSV-1, commonly referred to as cold sores) or Herpes Simplex Virus type 2 (HSV-2).Over 75 % of Australians carry HSV-1 (which usually causes cold sores but also causes about 40 % of genital herpes)1 which is most commonly acquired as a child from contact with relatives, usually from kissing and about 12 % of adult Australians carry HSV-2 (the commonest cause of genital herpes) 2. Teens today may be more susceptible to one type of genital herpes infection once they become sexually active than teens in years past, a new study suggests.
In the study, adolescents ages 14 to 19 who had their blood tested between 2005 and 2010 were less likely to have antibodies against herpes simplex virus type 1(HSV-1) compared with teens who had their blood tested between 1999 and 2004. The reason for the decline in HSV-1 protection among young people over the years is likely the result of improved living conditions and better hygiene, which makes young people less likely to contract oral herpes, the researchers said. The lack of antibodies against HSV-1 in today's teens suggests that many are not becoming infected with the virus when they are children; during childhood the virus typically spreads through skin-to-skin contact. In addition, teen who lack antibodies against HSV-1 may be more likely to develop symptoms from an infection with herpes simplex virus type 2 (HSV-2), another type of herpes simplex virus that is almost always transmitted sexually, and tends to cause more severe disease than HSV-1.
In the past, doctors were taught that HSV-1 causes illness "above the waist," while HSV-2 causes illness below the waist, said Dr. But, "for over a decade, HSV-1 has been migrating below the waist as cause of genital herpes," Schaffner said.


The reason for this appears to be a decrease in protection against HSV-1 -- shown in the new study as a decline in teens with antibodies against HSV-1 -- coupled with an increase in the prevalence of oral sex, which can spread oral herpes viruses from the mouth to the genitals, Schaffner said. While fewer oral herpes infections in kids may sound like a good thing, it had the unanticipated effect of an increase in HSV-1genital herpes infections, Schaffner said. This increase could in turn lead to an increase in the future in genital herpes infections passed from mother to child during birth, Dr.
The findings underscore the need to develop a herpes vaccine that protects against both HSV-1 and HSV-2, Schaffner said.
Scientists should continue to monitor HSV-1 and HSV-2 antibodies in teens to better understand the changing epidemiology of the disease, and inform vaccine development, the CDC researchers said. In this age group, the percentage of those with antibodies against HSV-1 declined 23 percent.
In fact, in recent years, the virus is causing an increasing portion of genital herpes infections -- as many as 60 percent of genital herpes infections among young adults in the United States. As a result, they may be more prone to contracting HSV-1 as a sexually transmitted disease once they become sexually active, according to the researchers from the Centers for Disease Control and Prevention.


William Schaffner, a professor of preventive medicine and infectious disease at Vanderbilt University in Tenn., who was not involved in the new study. The percentage of people with antibodies against HSV-1 declined for all age groups between the two time periods, but the biggest decline was seen among teens. David Kimberlin, of the University of Alabama at Birmingham, wrote in an editorial accompanying the study. If we begin to see more HSV-1 infections in teens as they become sexually active "it is logical to hypothesize that we will see neonatal herpes more frequently over the next decade," Kimberlin said.



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