Protect your cats and avoid costly medical care to treat vaccine-preventable diseases with Solo-Jec Feline 3 Vaccine. Solo-Jec Feline 3 is for the vaccination of healthy, susceptible cats 8 weeks and older to aid in the prevention of Feline Rhinotracheitis, Calicivirus and Panleukopenia. It only takes a few moments to vaccinate your cats easily and safely.