Four of them are from China. Work has even begun on a plant capable of producing 100 million doses a year. Sinovacs vaccine is among the three experimental COVID-19 vaccines China has been using to inoculate hundreds of thousands of people under an emergency use program. Worldwide, there are at least 10 experimental coronavirus vaccines in late-stage clinical trials, according to the World Health Organization. Pfizers vaccine, developed in partnership with Germanys BioNTech SE, is undergoing late-stage tests involving 3,100 volunteers in Sao Paulo and Bahia states.
cdivided together with trials is the second mentioned vaccine.
( z0 vaccine :ARG1-of ( z1 mention :ord ( z2 ordinal-entity :value 2 ) ) :ARG1-of ( z3 divide :ARG3 ( z4 try ) ) )
(z0 / vaccine
    :ARG1-of (z1 / mention-01
                 :ord (z2 / ordinal-entity
                          :value 2))
    :ARG1-of (z3 / divide-02
                 :ARG3 (z4 / try-01)))
cdivided together with trials is the second mentioned vaccine .
z3 :ARG3 z4
z2 :value 0
z1 :ord z2
z0 :ARG1-of z1
z0 :ARG1-of z3