Brief:
Low chances of infection but better get vaccinated.

Detailed:
Hi it's Dr.Muhammad Ahmad i have carefully read you question and will try to answer in detail.

In thin changes of your husband catching the flu are rare but i will help you understand how it spreads...it spreads between humans when infected people cough or sneeze,other people breathe in the virus or touch something with the virus on it and then touch their own face.(so a towel or a tap used by that infected man can be a source in your husband's case) he should Avoid touching his eyes, nose or mouth after shower . Germs spread this way."He should wash his hand thoroughly back at home after reaching back from work.This flue doesn't spread through food or pork in food.The swine flu in humans is most contagious during the first five days of the illness,(so if that other person has been treated already then chances of infecting others further drop) although some people, most commonly children, can remain contagious for up to ten days.

Conclusion: Get Him vaccinated
Take precautions as i told you like frequent washing of hands with soap and water or with alcohol-based hand sanitizers, especially after being at a place where the patient worked. Chance of transmission is also reduced by disinfecting workplace surfaces, which can be done effectively with a diluted chlorine bleach solution.(this can be suggested to owners)
It can spread in coughs or sneezes, but an increasing body of evidence shows small droplets containing the virus can linger on tabletops, telephones and other surfaces and be transferred via the fingers to the eyes, nose or mouth.
Social distancing, another tactic, is staying away from other people who might be infected.

Hope that Answered your Query . Wish you and your husband lasting health.