Qualitatively and quantitatively speaking of two kinds of ojas, parā ojas is the factor which sustains life while aparā ojas is claimed to be responsible for the immune strength technically termed as oja bala.There are three types of immunity (vyaadhiksamatva or bala) in Ayurveda:Sahaja: Congenital or Natural, Kalaja: Time, Season, Age, and Yuktikruta: Acquired.
