Varicella 
virus vaccine (Varivax); 
Vaccine; Single dose vials: 0.5 mL; 0.5 mL SC 
 1-12 y: Single dose 
 >12 y: 2 doses; second dose 4-8 weeks after first dose. Longer interval between first and second dose does not necessitate third dose but may leave 
 the person unprotected in the intervening months.