Open Access Research article

Concomitant malaria among visceral leishmaniasis in-patients from Gedarif and Sennar States, Sudan: a retrospective case-control study

Erika van den Bogaart*, Marieke MZ Berkhout, Ayman BYM Nour, Pètra F Mens, Al-Badawi A Talha, Emily R Adams, Hashim BM Ahmed, Samira H Abdelrahman, Koert Ritmeijer, Bakri YM Nour and Henk DFH Schallig

BMC Public Health 2013, 13:332  doi:10.1186/1471-2458-13-332

PubMed Commons is an experimental system of commenting on PubMed abstracts, introduced in October 2013. Comments are displayed on the abstract page, but during the initial closed pilot, only registered users can read or post comments. Any researcher who is listed as an author of an article indexed by PubMed is entitled to participate in the pilot. If you would like to participate and need an invitation, please email info@biomedcentral.com, giving the PubMed ID of an article on which you are an author. For more information, see the PubMed Commons FAQ.

'Retrospective" case-control study??

Berihun Megabiaw Zeleke   (2015-02-17 10:32)  University of Gondar

I am very happy to read such a study on a neglected tropic epidemic infectious disease.
Have few comments on the article
1. Case-control study is always retrospective by its very nature! hence, no need to say retrospect since no prospective case-control study exists.
2. This study is a typical survey followed by an internal comparison group (created after enough number of the two groups were obtained). What would the investigators have done if there were very few co-infections or almost all were con-infected. That would have stoped at survey stage and case control was optional at the start.
Similarly, it was stated as ....multicenter retrospective survey!" survey is not retrospective (does it mean the data was already collected in the past and investigators used a secondary data?).
Case-control study is done to identify determinant factors, the conclusion lacks such components.

Competing interests

No competing interest at all and strongly believe that my comments will improve the paper and will by no means have any impact on the fact that it is published.

top

Post a comment