The likely infectious agent for a rash that intensifies upon exposure to the sun is the B19 virus.
The B19 virus is a very harmful virus that uses humans as hosts and is characterized to generate coughs and sneezes.
This virus (B19) is well known to attack the respiratory airways and intensifies its attack upon sun exposure.
In conclusion, the likely infectious agent for a rash that intensifies upon exposure to the sun is the B19 virus.
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