We check this website, now historyofvaccines.org is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is historyofvaccines Down Right Now? - NO! historyofvaccines is up!
If you have problem with access to site historyofvaccines, and domain historyofvaccines.org is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).