Table 1 Differential diagnoses of causative organisms of peritonitis in patients with specific features or exposures

With catheter malfunction

- Fibrin clot (various bacteria with serious peritonitis)

- Catheter entrapment (EPS, long-standing peritonitis, etc.)

- Fungal colonization

Visible catheter colonization

- Fungal biofilm (filamentous molds [larger variably-colored, with hair-like diffuse edges, and central foci], yeast [usually white to off-white smaller translucent with defined edges], etc.)

- Bacterial biofilms (staphylococci, non-fermenting Gram-negative bacterium, Berholderia, Rhodococcus)

Exposure to biocontrol agents

- Bacteria (Agrobacterium, Bacillus, Pseudomonas, Streptomyces, etc.)

- Fungi (Candida, Coniothyrium, Trichoderma, Talaromyces flavus, Cylindrocarpon destructans, Fusarium oxysporum, Rhizoctonia solani, Sclerotinia nivalis, Botrytis cinerea, Phytophthora capsici, etc.)

Pet-related

- Pasteurella multocida

- Bordetella bronchiseptica

- Capnocytophagia

Marine-related

- Aeromonas spp.

- Edwardsiella tarda

- Erysipelothrix spp.

- V. vulnificus

- Mycobacterium marinum

- Shewanella spp.

Poor Oral hygiene

- Viridans streptococci

- Fusobacterium

- Actinomyces

- Hemophilus