# Bacteremia Due to Lactococcus lactis cremoris Following Food Poisoning: A Case Report

## TL;DR

A woman developed a rare infection from Lactococcus lactis cremoris after consuming unpasteurized dairy and recovered with antibiotic treatment.

## Contribution

This case report documents a rare instance of L. lactis cremoris causing bacteremia following food poisoning.

## Key findings

- L. lactis cremoris was isolated from the patient's blood culture.
- The patient recovered after seven days of intravenous doxycycline treatment.
- Consumption of unpasteurized dairy was identified as a likely source of infection.

## Abstract

Lactococcus lactis (L. lactis) cremoris is a catalase-negative, gram-positive cocci, rarely reported as a cause of human infections. We report a case of probable food poisoning caused by L. lactis cremoris in an adult female. A 58-year-old female was brought to the Emergency Department with a history of sudden onset of high-grade fever, vomiting, and febrile seizures. On investigation, all parameters were within normal range. However, L. lactis cremoris was isolated from her blood culture. The patient gave a history of travel to a local pilgrimage and consumption of unpasteurized dairy products for a week leading up to the incident. The patient was treated with intravenous doxycycline and recovered after seven days of treatment with sterile blood cultures on follow-up.