While both dengue and COVID-19 are different viral illnesses which spread through mosquito bites and respiratory droplet transmission respectively.
Similar signs between dengue and COVID-19
Key differences between a dengue fever and COVID-fever
With COVID-19, even though fever is a common symptom shared between all types of infections (mild, moderate of severe), the fever recorded during COVID is usually said to be low or moderate grade (touching to 102 degrees Fahrenheit max.) and well-managed with the use of medicines like paracetamols. If a fever persists for over 7 days, the infection is said to be severe or threatening, reports TOI.
Apart from the fever, there can also be a slight difference in the symptom onset of both the infections. While a COVID-infection can usually present with one or more symptoms at a time, which can all be different for people (start with a cough and fever, cough alone or gastrointestinal symptoms or just weakness), in the case of dengue, the most common signs of infection onset are symptoms like a headache or weakness, which may not always be the case if you have been exposed to COVID-19.