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C: extraintestinal disease), with resultant pathologic manifestations. It has been established that the invasive and noninvasive forms represent two separate species, respectively E. histolytica and E. dispar. These two species are morphologically indistinguishable unless E. histolytica is observed with ingested red blood cells (erythrophagocystosis). Transmission can also occur through exposure to fecal matter during sexual contact (in which case not only cysts, but also trophozoites could prove infective). Reproduced from: Centers for Disease Control and Prevention. Parasites and Health: Amebiasis. Available at: file://dpd.cdc.gov/DPDX/HTML/Amebiasis.htm .