Half-three-day fever is a fever that combines two fevers, one of which is three-day fever and the other is mucous fever. On the same day, an attack of three days and an attack of the mucous membrane occur - either by plexus and coincidence, or by change and proximity, or by entry and invasion. The first variety is the most difficult to recognize, followed by the second in difficulty. Sometimes both fevers are inseparable, because the putrefaction in them occurs inside the vessels, sometimes they are both periodic and passing, because the putrefaction in them occurs outside the vessels, and sometimes yellow gall fever is inseparable and the decay from it is internal, and mucous fever is not like that, but it happens the other way around .
Some people call pure semi-three-day fever only a complex fever, which combines a three-day fever with external decay and mucous fever with internal decay, and consider other fevers to be unclean, but this should not be particularly distracting. Often yellow gall fever is ahead in terms of putrefaction, but sometimes both fevers are the same in this sense. Further, sometimes the matter producing mucous fever is stronger, and sometimes the matter producing yellow gall fever takes over; be that as it may, the mucous matter makes the attacks of yellow gall fever longer and slows down the crisis, and the yellow gall matter acts on the attacks of the mucous in the opposite way. Often such a half-three-day fever drags on for a long time - up to nine months or more; sometimes some acute illness occurs from a half-three-day fever. In some cases, the half-three-day fever turns out to be one of the most destructive fevers, because it leads to tabes and severe chronic diseases.