The Centers for Disease Control and Prevention on Thursday said that nearly a thousand of United States countries have reached less than 30 percent in vaccination coverage.

CDC Director Dr. Rochelle Walensky said that most counties subject to questioning are from the Southeast and Midwest, which are also at risk for the virus infection. She said that the CDC observes the rise in disease rates in these counties because of the delta variant spread.

At present, about 25 percent of the sequenced virus cases in the US consist of the delta variant, as officials foresee that it can possibly become dominant in the US, surpassing the alpha variant.

The CDC said some counties record as swollen as 50 percent in delta variant rates.

“We expect to see increased transmission in these communities unless we can vaccinate more people,” she exclaimed.

According to an independent health research hub in the University of Washington, zip codes located in the states of Alabama, North Dakota, and Idaho post the highest rates of vaccine indecision.

Medical advisor to President President Joe Biden, Dr. Anthony Fauci, said in a press briefing that mRNA vaccines post about 80 percent effectiveness against the delta variant. Fauci cited The Lancet’s study, which also showed that a couple of AstraZeneca vaccines could provide 60 percent protection.

The medical advisor further cited another study which indicated that two Pfizer dozes can provide 88 percent protection against the delta variant, in terms of symptomatic disease.

A 96 percent protection can also be generated by Pfizer vaccines against being hospitalized with the delta variant, according to a study conducted by the Public Health England. AstraZeneca vaccine, on the other hand, showed 92 percent effectiveness after a couple of doses, CNBC reported.

“Preliminary data over the last six months suggest 99.5% of deaths from Covid-19 in the states have occurred in unvaccinated people … the suffering and loss we are now seeing is nearly entirely avoidable,” the CDC director said.