First symptoms are high fever and red eyes, then after a quiet period, a second rise in temperature, accompanied by signs of liver and kidney failure and bleedings (primarily intestinal).
Prvi simptomi so močno povišana telesna temperatura in rdeče oči, po obdobju dobrega počutja pa ponovno povišanje temperature, ki ga spremljajo znaki odpovedi jeter in ledvic ter krvavitve (primarno črevesne).