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US plans to start the third dose of the coronavirus vaccine from next month. In order to catch the unstoppable delta mutation, even those who have been vaccinated will need a booster dose. In the midst of this, protests have been held in some schools against the wearing of masks.



Correspondent Yunsu Kim came from Washington DC.



<Reporter> At



a school in Tennessee, USA, parents and students mix and shout slogans.



[Against wearing a mask! Against wearing a mask!]



Ahead of the start of school, when the school authorities made it compulsory to wear a mask, they protested against it.



In some schools in Texas, violence has even erupted, with parents tearing teachers' masks.



[Leonard / US Superintendent of Austin, Texas: It is a sad and disappointing thing. Even if you oppose the use of masks, you must know how to respect those who wear them.]



Florida and Arizona, which have banned mandatory masks altogether, have decided to punish school officials who violate the law and cut educational aid.



As the conflict over quarantine guidelines intensified, the delta mutation grew stronger.



The number soared to 99% of all new cases in the United States.



The U.S. health authorities officially announced the third booster shot and booster shot to catch the delta mutation.



[Biden/President of the United States: Delta mutations are twice as contagious as alpha mutations. It is very dangerous and continues to spread. Vaccines can stop that.]



Pfizer and Moderna plan to start booster doses next month for all Americans who have been vaccinated for eight months.



In the face of a series of protests not to wear a mask, let alone a vaccine, many point out that it is questionable how effective the third dose of the vaccine will be in catching the delta mutation.



(Video coverage: Park Eun-ha, video editing: Lee Hong-myung)