This is the 11691st most frequent Russian word.
заболеваемость
The incidence or rate of illness/disease.
The word 'заболеваемость' in this sentence refers to the frequency or rate at which cases of flu occur during a specific period (winter).
Заболеваемость гриппом этой зимой достигла рекордных значений.
The incidence of the flu this winter reached record levels.
Here, 'заболеваемость' describes the occurrence rate of infectious disease cases within a particular region.
В регионе наблюдается снижение заболеваемости инфекционными заболеваниями.
The region is witnessing a decrease in the incidence of infectious diseases.
In this context, 'заболеваемость' refers to the general prevalence rate of illnesses, emphasizing a probable causal factor—environmental conditions.