Table 1. Number of citations in PubMed over the last five years, 2008–2012.

Parasite Species	Approximate Number of Human Cases	Number of PubMed Citations over the Last Five Yearsb	PubMed Citations per Millions of Human Cases	References
Schistosoma japonicum	1 million	644	644	Steinmann et al. 2006 [1]
Schistosoma mansoni	54 milliona	1,371	25	Van der Werf et al. 2003 [3]
Schistosoma haematobium	112 milliona	342	3	Van der Werf et al. 2003 [3]

^aSub-Saharan Africa only.

^bSearch conducted on July 14, 2012.