"The mutations were something that could not be predicted, which have caused a more rapid spread than last year," said Thailand's National Vaccine Institute.
If businesses in Bangkok do not abide by the new COVID-19 restrictions, those responsible may also face up to a year in prison.
AstraZeneca asked for an extension from the original December goal until next May as Thailand has struggled with increases in COVID cases and deaths.
A surge in new cases and deaths due to the more contagious Delta variant has caused a strain on hospital facilities and threatens economic setbacks.
In Thailand, 618 of 677,348 medical workers who received two doses of the Sinovac vaccine have since become infected with COVID-19.
The nightly curfew will take effect on Monday among other restrictions as Thailand's health officials announced 9,276 new COVID-19 cases.
The new measures include closing spas, limiting hours for public transit and restricting the opening times of markets and convenience stores.
Thailand struggled to contain the Delta variant and reported 992 deaths in June after a surge that arrived in early April continued.
The hoax video hit over six million views and claimed to have found "new creatures" in caves in Thailand, but the true story behind the clip was very different.
U.S. citizen Jason Matthew Balzer admitted to killing his wife in Thailand and burying her in the nearby woods.
Jason Matthew Balzer had been on the run from the police since earlier this week — he fled his home in the northern city of Nam shortly after his wife disappeared.
The country has recently been reporting about 2,000 cases a day, often with double-digit deaths.
As new COVID-19 cases rise in Thailand, authorities have issued new mask requirements. Prime Minister Prayuth Chan-ocha was among the first to be fined for not wearing a mask.
On Friday, the nation confirmed a daily record with 2,070 new COVID-19 cases. A day earlier, it reported its highest-ever death count.
Shipping delays mean that U.S.-based boba businesses are running low on boba pearls and tapioca starch.
Stunned shoppers watched the Asian water monitor lizard invade the 7-Eleven, toppling shelves in its wake.
Beloved family pet Hurjun was eaten by a python over the weekend, according to a viral Facebook post by his owner, Kanchi Nard.
Military airstrikes in Myanmar this week forced thousands to flee, seeking shelter across the border in Thailand.
A 45-year-old man was terrified when he found a python in his toilet bowl. A rescue team worked to retrieve the snake safely.
The Siberian Husky didn't stir during a recent security test at a jewelry store in Thailand, and has gone viral for her slumber.
Demonstrators are demanding reforms to Thailand's monarchy.
Boonsong Plaikaew, 54, said she was "just doing my stuff," when the snake struck.
Thailand's brothels were closed for months due to Covid-19. Only in the government's fifth round of "easing" restrictions were they allowed to light their familiar lamps again.
All passengers and crew members managed to safely disembark as the ship was sinking into a Bangkok river following a suspected leak.
"We hope the vaccine could generate neutralizing antibodies in humans seen in monkeys and mice," vaccine researcher Kiat Ruxrungtham said in a press conference on July 12.
As work dries up, many owners are struggling to cover the costs of keeping an elephant. In some instances, animals have been set free to fend for themselves.
The absence of beachgoers offers turtles the chance to hatch without disturbance, while a lack of activity in the water enables adult turtles to mate closer to the shoreline.
Dozens of elephant camps in Chang Mai, many of which have faced criticism over animal cruelty allegation, were ordered to close by the government to curb the spread of COVID-19.