AstraZeneca taps Scottish firm for tenth COVID-19 vaccine supply deal

(Reuters) - AstraZeneca has signed its tenth supply-and-manufacturing deal for its experimental COVID-19 vaccine with a Scotland-backed firm as the British drugmaker ramps up efforts for wider trials of the potential treatment.Symbiosis Pharmaceutical said on Wednesday it agreed to make and supply an unspecified number of units of the vaccine, AZD1222, for AstraZeneca to use in clinical trials. The companies did not provide any financial terms of the deal.AstraZeneca Chief Executive Officer..