Coronavirus testing sites across the US are overwhelmed. Aerial photos of long drive-thru lines in Texas, California, and Virginia show what that looks like.

• As the coronavirus continues to spread across the US, testing sites and laboratories are struggling to meet the demand.
• This is causing delays in testing and getting results.
• These aerial photos show what coronavirus testing lines have looked like throughout the pandemic, from spring to summer.
• Visit Business Insider's homepage for more stories.

SEE ALSO: "It's our neighborhood, but it's also a safety net:" How households in a Texas neighborhood banded together to exchange essential items and help each other through the coronavirus pandemic.

DON'T MISS: 8 of Atlantic City's famous casinos just reopened for the first time since March. These photos show just how different the casino experience is going to be after the pandemic.

Andrea Rosales waited almost three hours for her son to get tested in Austin, Texas, and Galileo Gonzalez waited nine days for his results in San Antonio, the Texas Tribune reported in June.

Source: Texas Tribune

Texas is one of 33 states where coronavirus cases are rising this week, per data from Johns Hopkins University.

Source: Johns Hopkins University

Across the country, coronavirus testing sites and labs are overwhelmed. On June 27, The American Clinical Laboratory Association warned it would soon reach testing capacity. By the week of July 10, Business Insider's Morgan McFall-Johnsen reported that some results were taking four to six days to come back.

Source: Business Insider, American Clinical Laboratory Association

A coronavirus test involves swabbing a patient's nose and throat and then testing the sample. Results take at least 24 hours to become available, per The New York Times. When labs are overwhelmed with more swabs than they can test, the results can take up to a week or longer, McFall-Johnsen reported.

Source: Business Insider, Business Insider, The New York Times

Testing supply shortages have also contributed to delays in Omaha, Nebraska, and Arizona, the New York Times reported on July 6. The Tribune reported that Texas was short on testing equipment in late June.

Source: Texas Tribune, The New York Times

When someone tests positive a week after being swabbed, it's possible that they have already infected others before knowing they had the virus. This makes quarantining and contact tracing less effective.

Source: Business Insider

This photo was taken on April 18 in Springfield, Tennessee, when the Tennessean reported that test results were expected to take about 72 hours. Last week, Tennessee Health Commissioner Lisa Piercey told the publication she has seen it take up to 12 days to get results back.

Source: Tennessean, Tennessean

The photo was taken on April 30 in Woodland Hills, California, when Los Angeles tested about 10,000 people in one day, Mayor Eric Garcetti told the LA Times.

Source: Los Angeles Times

Last week, the LA Times reported that the county can test 26,000 people a day, but some say results take more than a week. The photo below from July 8 shows long lines of cars at Dodgers Stadium.

Source: Los Angeles Times

In South Florida, some labs are seeing wait times as long as two weeks for test results, the Sun-Sentinel reported on July 10.

Source: Sun-Sentinel 

This photo was taken on May 20, when the state's testing positivity rate, or the number of people whose results said they were infected with the coronavirus, was decreasing. Now, it's increasing.

Source: NBC12, Johns Hopkins University

In early July, NBC reported that some people in Virginia were waiting about a week to get results back.

Source: NBC