Comparing the number of infections, people catch cold so much more often than flu .Why haven’t we spent time and effort on developing vaccines to the cold virus ? a)The cold viral particle change over time, too difficult to develop a vaccine b)The cold viral remain stable over time and lose their ability to infect human over time c)The cold viral particle constantly change over time , catch a cold virus will result in vaccination for a long time d)There are too many strains of the cold virus and the symptoms are mild

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