"decline incidence" is a correct and usable phrase in written English.
You can use it when discussing a decrease in the rate or frequency of particular event or occurrence. For example, "We have seen a decline in incidence of outbreaks in the region since implementing the new health regulations."
A further surveillance study will be required to evaluate decline incidence of Hib disease associated with the investigational DTP-HB-Hib combination vaccine.
Practice effects could lead to underestimation of the rate of cognitive decline, incidence of dementia, and, if the magnitude of practice effects differs by background characteristics, to incorrect inferences about determinants of cognitive decline [ 41, 42].
A happy medical mystery: a declining incidence of major diseases in wealthy countries.
To identify patterns of hand, foot and mouth disease (HFMD) incidence in China during declining incidence periods of 2008, 2009, and 2010.
Because of declining incidence and a presentation that may overlap with other conditions, ARF may not be considered in the differential diagnosis.
Declining incidence and spatial heterogeneity complicated the design of phase 3 Ebola vaccine trials during the tail of the 2013 16 Ebola virus disease (EVD) epidemic in West Africa.
Over the course of the mid-late 1900s, the provision of healthcare services, improved community sanitation and hygiene, and scientific discoveries including the development of vaccinations contributed to a declining incidence of infectious diseases (Baum 2011).
We observed a declining incidence of acromioplasty.
Since then, HIV prevalence declined with the declining incidence.
Declining incidence was evident regardless of gender and age.
This can be due to declining incidence or declining case detection.
