<s>[INST] How is dengue fever diagnosed? [/INST] If a dengue infection is suspected, a blood test will be performed to check for the virus. A tiny needle is used to draw a blood sample from a vein in your arm during a blood test. The sample is then taken to the lab to examine under the microscope and confirm the diagnosis. Source: UJALA CYGNUS. Link: https://ujalacygnus.com/blog_post/frequently-asked-questions-about-dengue-fever/. Field: Infectious Disease. Disease: Dengue </s>