FEB 23, 2019 2:34 PM PST

Is Facklamia Species an Important Pathogen?

WRITTEN BY: Dena Aruta

Facklamia species are Gram-positive, facultatively anaerobic bacteria that present a challenge for clinical labs to identify. It's α-hemolytic, catalase negative and is often misidentified as Streptococcus viridans group (SVG). Due to the difficulties in identifying Facklamia species, its prevalence in clinical infections may be underestimated. Rahmati et al. present three cases of Facklamia species bacteremia and the problems encountered by the clinical laboratory in correctly identifying this potential pathogen. 

Case 1 was a 64-year-old male who was an IV drug user. Imaging studies revealed a left atrial mass involving the anterior mitral valve leaflet. His WBC count was significantly elevated and had 2 out of 2 blood cultures positive for Gram-positive cocci in chains. The isolate was initially identified as SVG based on biochemical testing (PYR negative, A and P discs negative) and pinpoint, α-hemolytic colonies. Susceptibilities performed by E-test were unusual for SVG and had high minimum inhibitory concentrations (MICs) to cefotaxime and penicillin. Matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) analysis did not identify it. Gene sequencing yielded an ID of Facklamia ignava. 

Case 2 was a 36-year-old male who had attempted suicide. He developed aspiration pneumonia from intubation and then acute respiratory distress syndrome. Two sets of blood cultures were drawn due to fever and a high WBC count. One set of blood cultures became positive after three days with Gram-positive cocci in chains. The colonies were pinpoint, non-hemolytic, and PYR-negative. MALDI-TOF identified the organism as Abiotrophia defectiva; however, the organism's growth on blood agar was atypical. Gene sequencing identified it as Facklamia languida, and its sensitivity pattern was similar to case 1. 

Case 3 was a 59-year-old female with diabetes, chronic kidney disease requiring hemodialysis, and non-alcoholic cirrhosis. Blood cultures drawn when she was admitted grew three organisms: Staphylococcus aureus, Peptostreptococcus anaerobius, and Gram-positive cocci in chains. The Gram-positive cocci had pinpoint growth, no hemolysis, and was PYR-positive. Since it couldn't be identified biochemically, gene sequencing was performed revealing Facklamia languida. 

Facklamia has been implicated in bacteremia from necrotizing fasciitis, endocarditis, chorioamnionitis, and CNS disease. The organism's virulence and its exact role in human infection and pathogenesis are not evident. Since it is often misidentified as SVG, it is likely that many cases are missed. It's vital that this organism is correctly identified due to is potential to be resistant to β-lactam antibiotics, which is unusual for SVG, and may create treatment problems. 

About the Author
  • After earning my Bachelor of Science degree in biology/chemistry from Virginia Polytechnic Institute and State University (aka Va. Tech), I went on to complete clinical rotations in laboratory medicine at Roanoke Memorial Hospital. I spent the next 21 years working in healthcare as a clinical microbiologist. In 2015, I combined my fascination with medicine and passion for writing into a freelance career, and I haven't looked back. Even though my expertise is in microbiology and infectious diseases, I'm adept at writing about any medical topic. Being a freelance writer allows me to pursue a career where I can work at home with my two feline assistants, Luke and Grace. I'm a firm supporter of animal rights and volunteer for a local rescue during my free time. 
You May Also Like
MAR 20, 2020
Cannabis Sciences
MAR 20, 2020
Safety Guidelines for Staying High During the Pandemic
In times of high anxiety, uncertainty and home quarantine, stocking up on cannabis in legal states seems almost as popular as the worldwide runs on toilet
MAR 23, 2020
MAR 23, 2020
The Loss of a Sense of Smell May be a Major Symptom of COVID-19
The loss of the sense of smell may be a symptom of a COVID-19 infection in people with no other symptoms.
MAR 24, 2020
Genetics & Genomics
MAR 24, 2020
Crumpling Graphene Makes It an Ultra-Sensitive Biosensor
Liquid biopsies often need to make many copies of RNA or DNA before they are detectable. New research aims to change that.
MAR 25, 2020
Health & Medicine
MAR 25, 2020
Boosting Your Immunity to Avoid COVID-19 Infection
With the COVID-19 pandemic at the forefront of most people’s minds, you might be wondering what you can do to keep yourself healthy. Though many are
MAR 30, 2020
MAR 30, 2020
When is Stress Good for You?
Although stress has a pretty bad reputation- often touted as a major compounding factor for many diseases- some stress is actually good for you. But when?
APR 06, 2020
APR 06, 2020
Positive Effects of Most Popular Diets Disappear After a Year
While evidence suggests that most diets lead to similar modest losses in weight and improvements in cardiovascular risk factors such as blood pressure with
Loading Comments...