It's tricky to develop a vaccine for the common cold because: * 1. All colds are caused by bacteria. 2. The common cold isn't caused by pathogens. 3. Many different viruses cause cold symptoms. 4. The - QAmmunity.org

It's tricky to develop a vaccine for the common cold because: * 1. All colds are caused by bacteria. 2. The common cold isn't caused by pathogens. 3. Many different viruses cause cold symptoms. 4. The

asked Apr 6, 2023 124k views

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