Serum Institute of India's Covishield vaccine will cost private hospitals Rs 600 per dose and state governments Rs 400 per dose, a rate which will also apply to central government procurement, once the existing contract for Rs 150 a dose ends, its chief executive said on Wednesday. The world's largest vaccine maker announced the pricing of AstraZeneca shots it manufactures at its Pune facility, following the government decision to open up inoculation to all citizens above 18 years of age.