罹患[rikan] contracting a disease
罹災[risai] suffering (from a calamity)
罹災者[risaisha] victims
罹災民[risaimin] victims

罹病[ribyou] contraction of a disease
罹る[kakaru] to suffer from
病気に罹る[byoukinikakaru] to contract a disease
罹患率[rikanritsu] disease rate