The tour comes just days after a large political gathering in Narok on Monday.
Kenya renewed Strategic Partnership with UK on Monday.
Measles outbreaks have already been reported in 18 counties.
Institutions pledged to integrate behavioural sciences in aid and development programmes.
Atellah lauded Health CS Aden Duale for his leadership, which he said had led to an end to numerous demonstrations and strikes.
Construction of the killer Bridge began in December 2021 soon after it claimed at least 32 lives but it stalled.
6,000 youth graduated on Saturday, while other 6,000 on Sunday
The extension follows Monday's one day extension that was set to end at midnight, on Tuesday.
Brain death is legally and medically recognised as death in Kenya.
