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Since July , there have been outbreaks of H3N2 variant viruses with the matrix M gene from the H1N1 pandemic virus in multiple U. To receive weekly email updates about Seasonal Flu, enter your email address:. Skip directly to site content Skip directly to page options Skip directly to A-Z link. Influenza Flu.

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Phone: Fax: In this set of four photos, dengue hemorrhagic fever virus kills untreated monkey cells lower left , whereas DRACO has no toxicity in uninfected cells upper right and cures an infected cell population lower right. Caption :. In the left set of four photos, rhinovirus the common cold virus kills untreated human cells lower left , whereas DRACO has no toxicity in uninfected cells upper right and cures an infected cell population lower right. Similarly, in the right set of four photos, dengue hemorrhagic fever virus kills untreated monkey cells lower left , whereas DRACO has no toxicity in uninfected cells upper right and cures an infected cell population lower right.

Enlarge image. More MIT News. In addition, studies are underway to determine whether some variants could be associated with more severe disease. Bollinger explains that it may be more advantageous for a respiratory virus to evolve so that it spreads more easily. On the other hand, mutations that make a virus more deadly may not give the virus an opportunity to spread efficiently. Ray says that widespread infection with the delta variant has resulted in an increased number of cases in children, including uncommon severe infections and deaths.

As long as the coronavirus spreads through the population, mutations will continue to happen, and the delta variant family continues to evolve. It is worrisome that similar changes to the spike protein are arising independently on multiple continents. Bollinger says that as of now, none of the new coronavirus variants call for any new prevention strategies. Ray stresses that both vaccination and human behavior are important. Limiting the spread of the virus through maintaining COVID safeguards mask wearing, physical distancing, practicing hand hygiene and getting vaccinated gives the virus fewer chances to change.

It also reduces the spread of more infectious variants, if they do occur. The virus seems to have some limitations in its evolution — the advantageous mutations are drawn from a relatively limited menu — so there is some hope that we might not see variants that fully escape our vaccines.

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