What is the incubation period for viral conjunctivitis?

• A. 1-2 days
• B. 12 hours - 12 days
• C. 2-4 weeks
• D. 30-60 minutes

Answer: (B)

Incubation period is the time between when someone is exposed to the virus and when symptoms first appear. For viral conjunctivitis, typically caused by adenovirus, symptoms such as redness, tearing, and a gritty feeling usually develop within a window that can range from several hours up to about 12 days after exposure. That broad span explains why a range of 12 hours to 12 days is the best answer. Shorter windows like 1–2 days are less typical, while much longer periods (weeks) aren’t characteristic, and extremely brief times (minutes) aren’t plausible for this infection. Remember, the infection is contagious during this period, so good hand hygiene and avoiding sharing towels or eye drops help prevent spread.