Severe diarrhoea due to Cystoisospora belli infection in a Good syndrome patient

We have read with great interest the article “Uncommon and fatal case of cystoisosporiasis in a non-HIV-immunosuppressed patient from a non-endemic country” [1] appeared in the February 2018 issue of Parasitology International. Lucie Post and colleagues reported a fatal case of severe diarrhoea due to Cystoisospora belli in a patient affected by rheumatoid arthritis on corticosteroid and immunosuppressive therapy. They concluded that unusual parasitic infections should be considered in non-HIV im- munocompromised individuals presenting with severe chronic diar- rhoea. We strongly agree with this observation and we wish to report the case of a Good syndrome patient suffering from severe diarrhoea due to Cystoisospora belli.