There's nothing to worry about. Whether he coughed directly in your mouth or even a metre away from you, you would've still be exposed to the infectious aerosol. We are exposed to flu and other viruses all the time. More than 95% of the time nothing happens. I would not worry about it. If you get flu, there's no guarantee that it came from that person. In any event, there is no cure for the common cold and flu antibiotics are only prescribed in certain special situations when influenza is the cause and there are also complicating symptoms.
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