(stem 発(はっ)症(しょう)し (hasshō shi), past 発(はっ)症(しょう)した (hasshō shita)) for signs of an illness to appear Conjugation of "<span class="searchmatch">発症</span>する" (See Appendix:Japanese verbs)...
【<span class="searchmatch">発症</span>】 [noun] outbreak of illness [verb] for signs of an illness to appear...