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Local health care providers and diagnostics companies are feeling the squeeze as demand increases for Covid-19 testing amid fears of the more-contagious Delta variant. The pattern has also affected companies that manufacture and process the tests, such as Quest Diagnostics. As of this week the Secaucus, N.J.–based company has performed 44.5 million tests since the beginning of the pandemic.

If you're not sure what's causing your symptoms, you might want to start with an allergy test first. "When it comes to allergies, knowledge is power," says Jeffrey S. Dlott, MD, MS, senior medical director for Quest Diagnostics.

U.S. laboratory Quest Diagnostics Inc said on Thursday demand for COVID-19 testing had increased since the end of June as the more infectious Delta variant spreads across the country.

Quest Diagnostics CEO Steve Rusckowski told CNBC the company is seeing an increase in Covid-19 tests as the more contagious delta variant spreads across the country.

Quest Diagnostics Inc. reported Thursday second-quarter adjusted profit that more than doubled to beat expectations, as revenue also topped forecasts, as the recovery in the lab results and diagnostics company cited a faster-than-expected recovery in its base business.