Seems strange that J&J wouldn't want jjvaccines.com or jjvaccine.com (or jandjvaccines.com for that matter?)
Edit: I see their main site is jnj.com so I see how it makes sense though..
Congrats! The brilliant thing was you were able to secure a name that takes advantage of a specific brand name with great timing without the danger of a UDRP (I don't think JNJ is a registered TM of Johnson & Johnson... I guess I need to look it up. If it is, then this was risky). Bravo!