The blast in the east of Kabul wounded 33 people, including many bystanders, the latest in a wave of bombings to hit the city as the majority of foreign combat troops prepare to withdraw from the country by the end of the year.
The source close to dos Santos said the offer by her Terra Peregrin company - which values the whole Portugal Telecom holding company at 1.21 billion euros ($1.51 billion) - already incorporates a premium to shareholders.
The former liberation movement turned governing party has kept its widespread support at the helm of one of Africa's healthiest economies - though dissent is growing over persistent poverty, inequality and a housing shortage.
The trial, which began on Sept. 2 and will monitor the volunteers for 48 weeks, is primarily aimed at assessing how safe the vaccine is. But the immune response offered hope that it would also be effective.
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