DEAR DR. ROACH: My husband and I will be traveling to the United Kingdom in July and will be on a ship with about 700 passengers. We are wondering whether it would be smart (or unnecessary) to get a COVID booster before the trip. We are both in our late 60s and have had all the available COVID shots. (The last one we received was on Oct. 10, 2024.)
I have mild asthma, and we both have BMIs of about…