Because there are four dengue strains, including species that are 1, 2, 3 and 4, which each year will contain various species of. Switch. If the patient is infected with dengue in any species. The body will create immunity against the strain throughout life and can create cross-immunity to the strain for some time. Before the immune system in different species will be lost. Therefore, Anyone who has fever and they can still come back into a back strain that differs from that used to be but the second infection often have more severe illness for the first time, but in most cases, the infected people are often no more than 2 times.
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