<prompt> A young boy of 18 years gets recurrent busts of otitis externa after swimming. Which of the following methods should be recommended?Not to swimUse 2 acetic acid after swimmingUse ear drops containing an antibiotic and steroidUse an antifungal ear drops after swimming  <response>: Use of 2 acetic acid or dilute alcohol is the most-effective method to prevent otitis externa after swimming. Antibiotic, antifungal or steroid containing drugs are not recommended for prophylaxis. 