LEPTOSPIROSIS IN THE CITY: A CASE REPORT

ABSTRACT

CASE A 58 year-old undomiciled man with no medical history presented with three days of anorexia, malaise, abdominal pain, and decreased urination. Exam was notable for scleral icterus. Lab-work revealed sodium 133 mEq/L, BUN 132mg/dL, creatinine 8.82 mg/dL, platelet 64 K/uL, total bilirubin 6.4 mg/dL, direct bilirubin 5 mg/dL. Lab-work two years prior was normal. HCV antibody was reactive, urinalysis revealed microscopic hematuria, and cocaine was detected on toxicology. Abdominopelvic CT, MRCP and renal sonogram were non-pathologic. On hospital day 5 his creatinine downtrended but total bilirubin continued to rise to a peak of 11.2 mg/dL and a leukocytosis without fever developed (peak 21.2 K/uL). Ceftriaxone was started empirically and a workup of blood cultures, viral serologies, ANA, alpha-1 antitrypsin, complement, cryoglobulin, ceruloplasmin level, microsomal, smooth muscle and antimitochondrial antibodies was normal. Review of his history suggested exposure to rodents as he slept close to a dumpster. Pending Leptospirosis serology, the antibiotics were adjusted to doxycycline. At discharge, the WBC and platelet counts normalized while the bilirubin and creatinine downtrended. IgM serology for leptospira later resulted positive. IMPACT/DISCUSSION: Leptospirosis is a worldwide zoonotic disease commonly associated with moist environments, poor housing and inadequate sanitation. Rodents are important reservoirs, shedding spirochetes through urine. Human infection results from exposure to animal urine, contaminated soil or water, or infected animal tissue. Portals of entry include cuts, mucous membranes or conjunctivae. Person-toperson transmission is rare. The incubation period is 5-14 days and illness severity ranges from subclinical to life-threatening. Disease manifestations include jaundice with acute kidney failure (Weil's disease), rash, conjunctival suffusion, hyponatremia, thrombocytopenia, microscopic hematuria, myocarditis, pulmonary hemorrhage, and meningitis. A biphasic illness, the acute febrile bacteremic phase can last 2-9 days followed by a period of apparent improvement. An “immune” phase then follows characterized by development of complications, as in our patient. During this phase, leptospires are absent from blood but may appear in the urine. While human cases of leptospirosis are rarely reported in the US outside of Puerto Rico and Hawaii (in the absence of travel), there was a significant rise reported to the NYC DOH in 2021. A potential explanation is an increase in housing insecurity and disruptions to waste management as a consequence of the COVID-19 pandemic. CONCLUSION: Leptospirosis is an important consideration in at-risk populations who may unknowingly be exposed due to living conditions. Our case of unexpected Weil's disease in an urban setting underscores the importance of a thorough social history as well as timely recognition of uncommon infections as possible reversible causes of multi- organ failure in the context of a changing world climate.