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If your oral and nasal mucous membranes dry, it is vulnerable for virus to attacks on.

If your oral and nasal mucous membranes dry, vulnerable to virus attacks on

If your oral and nasal mucous membranes dry, vulnerable to virus attacks on

If your slime membrane of the oral cavity and nasal cavity change into dry state, you will be attacked(or infected) easily by virus...

If your oral cavity and nasal cavity mucous membrane become dry, it's easy for virus to attack on them.

If the mucus that from membrane of your oral or nasal cavity begin to dry,It will be easy of access virus.