Mexico has tested just over seven people for every 1,000, and Brazil had tested nearly 12 in every 1,000 as of 21 July (the latest data available) - compared with more than 180 per 1,000 in the US (as of 6 August).
And of the tests these countries are doing, very high proportions are turning out to be positive, suggesting that they are not testing widely enough to find all cases.
What is being done to stop the spread?
As cases rapidly rose in Chile, the government tightened lockdowns across the country.
Mexico and Brazil have continued to take less severe lockdown measures than other Latin American countries.
Both have given out guidelines, but have not imposed national restrictions.
Marcia Castro, a global health professor at Harvard University, says that "the response in Brazil is far from ideal, and currently there is a lack of a uniform message coming from the leadership at different levels."
Other countries such as Argentina have imposed compulsory lockdowns.
Prof Castro says it is, along with Uruguay, among the countries in the region for now able to manage the spread.
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