In the case of nasal and throat samples, the nation for weeks has grappled with a dearth of test kits, swabs, chemical reagents and other supplies required to perform and process these tests. Many of these tests need to be processed by labs; some have reported a shortage of lab technicians, leading to a bottleneck of tests and lengthy delays for results.
Breaking down the different types of COVID-19 tests — and why Illinois and the nation have struggled with mass testing amid the pandemic

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