Regional AlertOccurrence of disease at same time likely to cause overlappingepidemics November 10, 2023By MBDS Team7 Nov 2023. People are more likely to get sick when the weather changes. Theoccurrence of dengue fever, hand, foot and mouth disease, chickenpox, pinkeye, respiratory diseases, and influenza at the same time is causing the risk ofoverlapping epidemics. Worse, these diseases also tend to increase in thenumber of cases due to the impact of the weather changes.