Palomar Medical Center's chief medical officer, Dr. Omar Khawaja, told NBC 7 that delivering two doses isn’t twice as difficult for medical teams, it's five to 10 times more difficult due to temperature controls, the expiration of the vaccines and how stable it is after it's drawn up by a pharmacist are all factors to consider, Khawaja said. Khawaja said Palomar’s home medical crews won’t wait long for the J&J vaccine, however. “I think we would give it maybe another week or so," Khawaja said. "We will start to activate secondary plans that would include using Pfizer and Moderna for our home health patients.”