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.

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

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.

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