1.   Landrigan, who has often worked to highlight health dangers in the environment, said the public faced little risk.

2.   By visiting South Africa, Mauritius and Botswana, she has worked to highlight three African democracies with strong economies.

3.   In her visits to South Africa, Mauritius and Botswana, she has worked to highlight three African democracies with strong economies.

4.   In her visits to South Africa, Mauritius in Botswana, she has worked to highlight three African democracies with strong economies.