It is just another reason to deny illegal immigrants entry into this country.  

"(1)Health-related grounds

(A)In general Any alien— 

(i)who is determined (in accordance with regulations prescribed by the Secretary of Health and Human Services) to have a communicable disease of public health significance; 

"(ii)(I)to have a physical or mental disorder and behavior associated with the disorder that may pose, or has posed, a threat to the property, safety, or welfare of the alien or others,"

is inadmissible."

9 USC Section 1182.

The ethics of this Congressional Law dating back to the 1950's is not an issue for me.

Zika is  a 'communicable disease' and a 'physical disorder'.