The number of days a fever caused by bacteria in children lasts cannot be generalized; fever duration is related to the strain of bacterial infection and the extent of the infection. Generally, a bacterial fever may last for 3 to 5 days, but in severe infections or infections with more pathogenic bacteria, the duration of the fever will be extended. The duration of fever caused by bacteria in children should be analyzed according to the condition, causing different strains of bacterial infections to cause different fever durations. Some of the more common pathogenic bacteria are hemolytic streptococcus, staphylococcus aureus, and streptococcus pneumoniae. Weakly pathogenic bacteria may have a shorter duration of fever, and will get better in 3-5 days. Fever from bacteria that are more pathogenic may last longer, 5-7 days or even longer. The duration of fever caused by bacteria in children is not only related to the causative species, but also related to the degree of the specific disease, if the degree is mild, the duration of fever will be relatively shorter, and the degree of seriousness may be relatively longer. Children with bacteria-induced fever need to seek medical attention in time to avoid delays.