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.

An aerial view from a drone as residents wait in line for the drive-thru COVID-19 testing center at the Ellis Davis Field House on July 2, 2020 in Dallas, Texas.Tom Pennington/Getty Images

• 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.

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.

People sit in their cars and wait in line at a COVID19 testing center on July 7, 2020, in Austin, Texas.      Sergio Flores/Getty Images

Source: Texas Tribune

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

An aerial view from a drone as residents wait in line for the drive-thru COVID-19 testing center at the Ellis Davis Field House on July 2, 2020, in Dallas.      Tom Pennington/Getty Images

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.

A line of cars waits to get into a drive-though COVID-19 testing site at the PNC Bank Arts Center in Holmdel, New Jersey, on March 24, 2020.      AP Photo/Seth Wenig

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.

An aerial view as vehicles line up down the street awaiting free coronavirus testing at the Robertson County Fairgrounds on April 18, 2020, in Springfield, Tennessee.      Photo by Brett Carlsen/Getty Images

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.

Cars line-up at a recently opened coronavirus testing site on April 21, 2020, in Brooklyn, New York.      Spencer Platt/Getty Images

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.

Dozens of cars line up as drivers await curbside Coronavirus testing at Hansen Dam in California.      Robert Gauthier/Los Angeles Times via Getty Images

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.

An aerial view as vehicles line up down the street awaiting free coronavirus testing at the Robertson County Fairgrounds on April 18, 2020, in Springfield, Tennessee.      Brett Carlsen/Getty Images

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.

Aerial view of over 100 vehicles lined up at the West Valley COVID-19 testing center at Warner Center on Thursday, April 30, 2020, in Woodland Hills, California.      Brian van der Brug / Los Angeles Times via Getty Images

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.

Testing continues on July 8, 2020, at Dodgers Stadium in California.      Al Seib / Los Angeles Times via Getty Images

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.

A long line of cars waiting to enter the COVID-19 drive-through testing site wraps around the Miami Beach Convention Center on June 25, 2020, around 11 a.m.      Emily Michot/Miami Herald/Tribune News Service via Getty Images

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.

Motorists line up at a drive-through site to collect samples for coronavirus testing in Leesburg, Virginia, on May 20, 2020.      REUTERS/Kevin Lamarque

Source: NBC12, Johns Hopkins University

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

Hundreds of vehicles wait for hours at Loudoun County's free coronavirus drive-thru testing at Philip A. Bolen Memorial Park May 20, 2020, in Leesburg, Virginia.      Katherine Frey/The Washington Post via Getty Images

Source: NBC