Phylogenetic tree appearance of intestinal protozoan isolated from COVID-19 patients. Phylogenetic tree of the different gene region nucleotide sequences of intestinal protozoans isolated from COVID-19 disease.The tree was constructed using Tamura 3-parameter model in MEGA software version 6.05. Bootstrap values shown are based on 100 replicas. Bar represents genetic distance as reflected by nucleotide divergence. Bootstrap analysis showed a high degree of variant between 0.05 and 0.07 of C. parvum isolates isolated from recurrent COVID-19 patients.