While recently exploring one of the United States most stunning national parks, 170 people caught a virus. More specifically, norovirus.

The National Park Service confirmed the outbreak at Yosemite National Park in Norther California. Only two cases of the virus were confirmed to be norovirus, but all 170 people showed the same symptoms.

Yosemite Park National Park Service stated, “the overwhelming majority of the reported cases are consistent with the norovirus.” Like food poisoning, the infected experienced nausea, vomiting, stomach pain and a fever.

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Some of the world’s most useful vaccines protect against more than one disease. The MMR vaccine is mostly associated with measles, but prevents mumps and rubella too. The Tdap vaccine also covers three diseases: tetanus, diphtheria and pertussis.

Now, in trying to find a vaccine for Zika, we may also have a vaccine for dengue.

A new study from January by the Walter Reed Army Institute of Research (WRAIR) offers the details. While testing an experimental vaccine, the group found that along Zika, it also helps prevent dengue.

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Flu cases reached nearly 19 million last week across the United States, with flu related deaths spiking.

After an early start to the season in places like Louisiana and Puerto Rico, the virus is nationwide. According to the CDC, as of early February the number of infections of flu B and flu A are about equal. The hospitalization rate for flu infections is 35.5 per 100,000, which is normal at this stage of the season. The percentage of influenza and pneumonia deaths is at 7.1%, falling just below the epidemic threshold of 7.2%.

The group suffering the most from this flu season is children. An increase of pediatric deaths in recent weeks brought the total to 78 this season.

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Do you remember your first bout with the flu? Probably not, since it happened decades ago.

But, your body remembers very well, at least according to a new study from the University of Arizona. The study showed the first flu virus your body encounters as a young child indicates how well your body will protect itself against the flu in the future.

This research is important, because recent flu seasons have been more dangerous than previous seasons.

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The human papillomavirus (HPV) remains the most common sexually transmitted infection. According to the CDC, about 79 million Americans are currently infected and around 14 million become infected with HPV each year.

Although, unlike with many other common illnesses, we have a way to prevent HPV. The widely-available HPV vaccine is nearly 100% effective against nine strains.

Upon infection, the virus can cause a wide range of health problems.

For most, it won’t show any symptoms, one of the reasons the STI is so commonly spread. But, HPV can also lead to symptoms like genital warts or something much more severe, such as cervical cancer.

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