Here the US seems to be opposing the rights of Lat-Am countries to use emergency measures to protect their citizens against "Chagas disease" because that would deny its pharma companies a lucrative & desperate market.
>> Take the following snippet, from Article QQ.A.5:
>> (a) The obligations of this Chapter do not and should not prevent a Party from taking measures to protect public health by promoting access to medicines for all, in particular concerning cases such as HIV/AIDS, tuberculosis, malaria, [US oppose: chagas] and other epidemics as well as circumstances of extreme urgency or national emergency.
>> Here, "[US oppose: chagas]" indicates the word "chagas" is disputed, with the United States opposing its inclusion in the treaty. This is a reference to Chagas disease, a form of trypanosomiasis, a parasitic disease primarily affecting Latin America. U.S. opposition can probably be attributed to pressure from the pharmaceutical industry.