(CNN)One is widespread but has key shortages across its supply chain.One remains questionably reliable and is only helpful after the fact.And one is still early in development — but could speed up and simplify results.Experts say ramping up the use of these three different types of coronavirus tests — the PCR test, the antibody test and the antigen test, respectively — is essential to reopening America’s shuttered economy safely.Despite the need, the availability of testing remains in frustratingly short supply and is dependent on individual states and local health care providers rather than the federal government. And increasing that availability of testing is difficult because of significant scientific and logistical issues.Here’s a look at each of the three main tests, their strengths and weaknesses, and the holdups that have slowed their rapid mass production.PCR testsWhat are they?Polymerase chain reaction tests, known as PCR, are the most common and most accurate tests for determining whether someone is currently infected with the novel coronavirus. How do they work? Every virus has a unique genetic code. The novel coronavirus PCR test works by starting with a throat swab or sputum sample from a patient, amplifying that specimen in a machine, and then looking

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