A health worker shows the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine before applying it to an elderly citizen at the Museum of the Republic at Catete Palace in Rio de Janeiro, Brazil February 25, 2021. REUTERS/Ricardo Moraes

A health worker applies a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to an elderly citizen at the Museum of the Republic at Catete Palace in Rio de Janeiro, Brazil February 25, 2021. REUTERS/Ricardo Moraes

A health worker prepares a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine before applying it to an elderly citizen at the Museum of the Republic at Catete Palace in Rio de Janeiro, Brazil February 25, 2021. REUTERS/Ricardo Moraes

People arrive at the Museum of the Republic at Catete Palace to get the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine in Rio de Janeiro, Brazil February 25, 2021. REUTERS/Ricardo Moraes

Elderly citizens arrive at the Museum of the Republic at Catete Palace to get the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine in Rio de Janeiro, Brazil February 25, 2021. REUTERS/Ricardo Moraes

A health worker applies a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to a citizen at the Museum of the Republic at Catete Palace in Rio de Janeiro, Brazil February 25, 2021. REUTERS/Ricardo Moraes

A health worker applies a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to an elderly citizen at the Museum of the Republic at Catete Palace in Rio de Janeiro, Brazil February 25, 2021. REUTERS/Ricardo Moraes

A health worker applies a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to a person at the Museum of the Republic at Catete Palace in Rio de Janeiro, Brazil February 25, 2021. REUTERS/Ricardo Moraes

A health worker applies a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to an elderly citizen at the Museum of the Republic at Catete Palace in Rio de Janeiro, Brazil February 25, 2021. REUTERS/Ricardo Moraes

A healthcare worker administers a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at a vaccination center in Santiago, Chile, February 16, 2021. Picture taken February 16, 2021. REUTERS/Ivan Alvarado

People wait to get a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at a vaccination center in Santiago, Chile, February 16, 2021. Picture taken February 16, 2021. REUTERS/Ivan Alvarado

A healthcare worker administers a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at a vaccination center in Santiago, Chile, February 16, 2021. Picture taken February 16, 2021. REUTERS/Ivan Alvarado

A healthcare worker administers a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at a vaccination center at La Florida area, in Santiago, Chile, February 18, 2021. Picture taken February 18, 2021. REUTERS/Ivan Alvarado

A healthcare worker prepares a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at a vaccination center in Santiago, Chile, February 16, 2021. Picture taken February 16, 2021. REUTERS/Ivan Alvarado

People wait to receive a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at a vaccination center at La Florida area, in Santiago, Chile, February 18, 2021. Picture taken February 18, 2021. REUTERS/Ivan Alvarado

A worker disinfects as a man sits inside a monitoring room after receiving a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at a vaccination center at La Florida area, in Santiago, Chile, February 18, 2021. Picture taken February 18, 2021. REUTERS/Ivan Alvarado

Rodolfo Carter, Mayor of La Florida, poses for a picture inside a monitoring room where people wait after receiving a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at a vaccination center at La Florida area, in Santiago, Chile, February 18, 2021. Picture taken February 18, 2021. REUTERS/Ivan Alvarado

Vials of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine are seen at a vaccination center in Santiago, Chile, February 16, 2021. Picture taken February 16, 2021. REUTERS/Ivan Alvarado

A container of the first batch of Chinese Sinovac Biotech's CoronaVac vaccine for COVID-19 is seen at a cargo terminal after its arrival from China to Hong Kong airport, ahead of the planned mass vaccination drive scheduled to be launched next week, in Hong Kong February 19, 2021,. Kin Cheung/Pool via REUTERS

Workers load a container of the first batch of Chinese Sinovac Biotech's CoronaVac vaccine for COVID-19 onto a truck at a cargo terminal after its arrival from China to Hong Kong airport, ahead of the planned mass vaccination drive scheduled to be launched next week, in Hong Kong February 19, 2021,. Kin Cheung/Pool via REUTERS

A container of the first batch of Chinese Sinovac Biotech's CoronaVac vaccine for COVID-19 is seen at a cargo terminal after its arrival from China to Hong Kong airport, ahead of the planned mass vaccination drive scheduled to be launched next week, in Hong Kong February 19, 2021,. Kin Cheung/Pool via REUTERS

A container of the first batch of Chinese Sinovac Biotech's CoronaVac vaccine for COVID-19 is seen at a cargo terminal after its arrival from China to Hong Kong airport, ahead of the planned mass vaccination drive scheduled to be launched next week, in Hong Kong February 19, 2021,. Kin Cheung/Pool via REUTERS

A health worker prepares a syringe before applying a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine on an elderly citzen in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

A health worker applies a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine on an elderly citzen in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

A health worker prepares a syringe before applying a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine on an elderly citzen in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

A health worker applies a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine on an elderly citzen in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

A health worker applies a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine on an elderly citzen in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

A health worker applies a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine on an elderly citzen in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

Elderly citzens wait in line to receive a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

Elderly citzens wait in line to receive a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

A health worker shows the empty syringe after applying a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine on an elderly citzen in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

A health worker prepares a syringe before applying a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine on an elderly citzen in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

A health worker shows the empty syringe after applying a Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine on an elderly citzen in Sao Goncalo near Rio de Janeiro, Brazil February 18, 2021. REUTERS/Ricardo Moraes

Soccer Football- Champions League - Round of 16 First Leg - FC Porto v Juventus - Estadio do Dragao, Porto, Portugal - February 17, 2021 Juventus' Alex Sandro in action with FC Porto's Jesus Corona REUTERS/Pedro Nunes

Disposable syringes are pictured as teachers get a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine in Santiago, Chile, February 16, 2021. REUTERS/Ivan Alvarado

Teachers wait to get a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine in Santiago, Chile, February 16, 2021. REUTERS/Ivan Alvarado

A healthcare worker administers a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine as Chile starts to vaccinate teachers in Santiago, Chile, February 16, 2021. REUTERS/Ivan Alvarado

A healthcare worker prepares a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine as Chile starts to vaccinate teachers in Santiago, Chile, February 16, 2021. REUTERS/Ivan Alvarado

A healthcare worker administers a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine as Chile starts to vaccinate teachers in Santiago, Chile, February 16, 2021. REUTERS/Ivan Alvarado

A healthcare worker administers a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine as Chile starts to vaccinate teachers in Santiago, Chile, February 16, 2021. REUTERS/Ivan Alvarado

An elderly citizen receives a CoronaVac vaccine at a municipal clinic which is a coronavirus disease (COVID-19) vaccine station, in Rio de Janeiro, Brazil February 16, 2021. REUTERS/Ricardo Moraes

A health worker receives a CoronaVac vaccine at a municipal clinic which is a coronavirus disease (COVID-19) vaccine station, in Rio de Janeiro Brazil February 16, 2021. REUTERS/Ricardo Moraes

A health worker of the Indigenous Special Sanitary District of Manaus carries a box of the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine as she leaves the Makira village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

A health worker of the Indigenous Special Sanitary District of Manaus prepares a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at Sao Jose Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

Health workers of the Indigenous Special Sanitary District of Manaus carry boxes of the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine as they leave the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

An Indigenous woman waits to receive the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at Sao Jose Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly TPX IMAGES OF THE DAY

An Indigenous man holds a baby before receiving a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at Sao Jose Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

An Indigenous woman with her child talks with a health worker of the Indigenous Special Sanitary District of Manaus as she waits to receive the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at Correnteza Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

An indigenous family is seen in their canoe before receiving a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

Indigenous people wait to receive the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine as boys are seen behind a window playing soccer, at Sao Jose Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

An Indigenous woman walks next to a health worker of the Indigenous Special Sanitary District of Manaus before receiving a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at Sao Jose Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

Health workers of the Indigenous Special Sanitary District of Manaus transport a box of the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine on a boat near the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

Indigenous people wait to receive the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at Correnteza Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

An Indigenous man talks with a health worker of the Indigenous Special Sanitary District of Manaus as he waits to receive the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at Correnteza Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

Indigenous people wait to receive the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine as boys are seen play soccer behind a window at Sao Jose Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

Indigenous people wait to receive the Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine as boys are seen play soccer behind a window at Sao Jose Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

A health worker of the Indigenous Special Sanitary District of Manaus administers Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to an Indigenous person at Sao Jose Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

A health worker of the Indigenous Special Sanitary District of Manaus administers Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to an Indigenous person at Makira Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

A health worker of the Indigenous Special Sanitary District of Manaus administers Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to an Indigenous person at Sao Jose Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly

A health worker of the Indigenous Special Sanitary District of Manaus administers Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to an Indigenous person at Makira Village in the Indigenous land Rio Urubu from the ethnicity Mura in the Urubu river banks in Itacoatiara, Amazonas state, Brazil, February 13, 2021. Picture taken February 13, 2021. REUTERS/Bruno Kelly