An increasing trend in the number of PEs sampled for serology was observed between 2017 and 2019 until a plateau above 24,000 PEs sampled per year was reached from 2019 to 2021.
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An increasing trend in the number of PEs sampled for serology was observed between 2017 and 2019 until a plateau above 24,000 PEs sampled per year was reached from 2019 to 2021.