Hello Fellows, The year before last, our hens were infected with dry Foul Pox and it nearly killed one of them. Now that we are starting again with chicks and have learned of this disease, I am taking precautions and have purchased the Foul Pox Vaccine. The issue I am having is that the information online is so varied. I have read to give it to them once, twice, when they are days old, when they are over "X" weeks, at both intervals, and the ages varies as well. My girls are 4 weeks old and I am wanting to know if once is enough and if now is the time, from someone that is experienced in vaccinations? Thanks for any advice!