Fixes issue#112

[ekamau]

• Please check if the PR fulfills these requirements

• [x] I have read the CONTRIBUTING guidelines

• [ ] A new item has been added to NEWS.md

• [ ] Tests for the changes have been added (for bug fixes / features)

• [ ] Docs have been added / updated (for bug fixes / features)

• [ ] Checks have been run locally and pass

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• What is the current behavior? (You can also link to an open issue here) linked to issue #112

• What is the new behavior (if this is a feature change)? Changes counts to n_seropositive and total to n_tested in R

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) Updates counts to n_seropositive and total to n_tested in R

• Other information:

[ntorresd]

This is addressed by PRs #199 and #200