CHICAGO (CBS)– Hundreds lined up for COVID-19 tests at a hospital on the West Side.

Hundreds showed up on Tuesday to be tested. Many of them had already waited in line on Monday.

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“I’m back here to today because I have to get back to work,” DuWade Moses said.

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Meanwhile, on the vaccine front, drug maker Moderna says its vaccine showed promise in early testing. All 45 people who received the trial vaccine developed antibodies to COVID-19, including the type of antibodies needed to fight off the virus.

Moderna’s vaccine is different from traditional ones which use a weakened or killed version of the virus itself. Instead, Moderna uses a piece of genetic code, triggering an immune response.

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Moderna says it will start what could be the final phase of testing in July.