I’ve been using this vaccine for several years for any new chicks. It has been extremely effective in preventing losses from Mareks disease. I use a booster method, so that the chicks get a booster around day 10. Since starting this booster protocol several years ago, I have not lost one chicken to Mareks.

Great product

I receive my product in less than two days. I’m very happy with this company.

Vaccine was not very effective, and I vaccinated each chick 2 times. Shipping is more expensive than the product. I wish there were better options, than this outdated vaccine for hobbyists. Producers get the better updated vaccines. Jeffers doesn't carry

I've been ordering this vaccine from Jeffer's for my chicks for several years and it's always been a positive experience. Their customer service is outstanding! Thanks Jeffer's!!!