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July 08, 2019 - 02:03 AM Derrick from Mexico emmanuel8s@gmail.com This is the job description http://12yo.icu/ 12yo Existing flu vaccines make the immune system create antibodies that recognise structures on the surface of the virus, to prevent infection with the most prevalent current strains. However, health authorities are often one step behind as new viruses with different surface structures are constantly evolving and vaccines have to be changed each year. |