It is a live vaccine which means it contains a weakened version of the chickenpox virus. As such, it is not recommended for those with a compromised immune system because of an illness like HIV or as a result of treatment such as chemotherapy.
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Brady Tkachuk was asked about being a proud American while being the Senators captain at a moment of heightened tension between the countries.
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Other campaign groups, like the Wildlife Trusts, insist that many more fish are at risk. They highlight research from Natural England that found that over seven million fish would die if no measures whatsoever were put in place.