Why Investors Didn't Leap for Joy After Quidel's Strong Q4 Performance

Shares of Quidel (NASDAQ: QDEL) skyrocketed 139% last year. The stock got off to a great start in 2021 as well, but has given up much of its gain. 

It seems likely that Quidel could extend its downtrend. The diagnostics company announced its fourth-quarter results after the market close on Thursday, and the healthcare stock fell as much as 7% in after-hours trading. Here are highlights from Quidel's fourth quarter.

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Source Fool.com