Texas can expect to receive the first 200,000 doses of the coveted Johnson & Johnson COVID-19 vaccine this week. The company announced that it has started the rollout process on March 1 — after the FDA approved its Emergency Use Authorization.

The Center for Disease Control gave the developer, Janssen Pharmaceutical, the final greenlight Sunday, February 28.

What does that mean for Houston? Mayor Sylvester Turner said the Houston Health Department is also anticipated to be on the list to receive Johnson & Johnson doses within the next seven days.

"That will be a game changer," Turner said at an event on February 28 afternoon. "There will be more vaccines available in a shorter period of time. We anticipate that we will probably get a shipment in sometime this week that will add to the Pfizer [doses] that we are using at NRG."

Turner said other clinics with the Houston Health Department have been administering the Moderna vaccine.

The Johnson & Johnson vaccine does have noticeable differences from the Pfizer and Moderna vaccines, experts said.

The MRNA vaccines each require two shots which are usually delivered weeks apart and stored in freezers. The Johnson & Johnson vaccine is a single shot that can be stored in a refrigerator for up to three months at 35 to 46 degrees.

However, Johnson & Johnson does not have as much of the COVID-19 vaccine produced as originally anticipated. ABC13 confirmed 3.9 million doses will be shipped out across the country this week. Johnson & Johnson announced roughly an additional 16 million doses by the end of the month.

"In the next few weeks, it won't have much of any impact because they only have at least three or four million doses available, and that's disappointing news," says Dr. Peter Hotez, dean of the National School of Tropical Medicine at Baylor College of Medicine. "In the longer term, over the next few months, it's really important because we need a greater vaccine supply. We are not going to get there with the two MRNA vaccines. We need probably up to five different vaccines in order to vaccinate the American people."

Recently, there has been a decline in COVID-19 hospitalizations and COVID-19 cases reported statewide. As of Sunday, about 5,700 Texans are in the hospital due to COVID-19, which is half the number of hospitalization in the beginning of the month.

Infectious disease epidemiologist Dr. Catherine Troisi says it's important for people to not let their guard down and that people should get tested if they have been in a high-exposure situation, or if they have been in direct contact with someone who has tested positive.

"Get vaccinated, don't worry about what vaccine it is," Dr. Troisi notes. "It's true that unfortunately there are not as many doses right now of the Johnson & Johnson vaccine as we have hoped, but the company is saying that by the end of June, they will have a 100 million doses, and that's into 100 million people because you don't need two doses.

"So, we expect to have 600 million doses of the other two vaccines, that's 300 million people," she continues. "That should be enough for everyone who wants the vaccine to be able to get it. With one caveat and that is as of right now we do not have a vaccine for children under age 16. Those trials are going on, hopefully as we go throughout the year there will be a vaccine licensed to 12 year-olds and then maybe going down to 8 years or older."

For more details on the Johnson & Johnson vaccine rollout, visit the FDA's website.

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This article originally ran on CultureMap. For more on this story, visit our news partner ABC13.