Concerns about coronavirus news out of China may have moved some vaccine-maker and travel stocks Friday. 

Shares of Moderna (MRNA), Pfizer (PFE) and Novavax (NVAX) all gained Friday, a broadly downbeat session that saw the S&P 500 slide 1.7%. Moderna was the biggest gainer on the benchmark index, rising more than 5%. Some stocks associated with international travel, meanwhile, retreated: Norwegian Cruise Lines (