If I have heart disease but need to go to pharmacy. Should I wear a mask and gloves?

Yes I think it would be best to wear a mask and gloves in your situation. Better be safe than sorry.

This is the time of pandemic, you can not recognize people suffering with Covid19 so best way to keep safe yourself wear mask and glove during this period. It is very necessary because you have heart disease, so if you want to go to pharmacy wear mask and glove.
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