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Seven new illnesses and 2 additional deaths have been confirmed in the outbreak, which has grown to 27 cases and 6 deaths.
About 90% of the cases reported in Canada in the past year have been in unvaccinated residents.
The researchers also discovered that UTIs in patients from high-poverty neighborhoods were 60% more likely to be caused by animal-to-human strains.
The findings highlight a critical gap in many national and global H5N1 surveillance systems.
The large-scale project was conducted by the Center for Infectious Disease Research and Policy's Vaccine Integrity Project.
The bat harbored the BRZ batCoV virus, which the researchers say has likely been silently circulating in Latin America for some time.
Officials waited more than 3 months after 2 whooping cough deaths to issue a statewide health alert.
Overall protection against infections peaked at 4 weeks after vaccination.
Prior to this year, there had only been 1 confirmed measles case in Utah since 2020.
Flights from Asia played a larger role in disease spread than those from other countries, the study found.
