COVID-19 testing and contact tracing as cases surge due to the highly transmissible Omicron variant.Niagara Region Public Health said it is beginning to shift resources away from contact tracing to delivering booster doses of COVID-19 vaccines, which it said can “better blunt” the Omicron wave.Growing case numbers are making it difficult for people to access testing in a timely manner, which in turn is delaying the identification of cases for followup, the health unit said.At the same time, Omicron has shortened the time between exposure and becoming contagious, making it less likely health officials can intervene early enough to break the chains of transmission, it said.