Camelidae and Cervidae Omphalophlebitis Study Guide

Overview and Clinical Importance

Omphalophlebitis (commonly called "navel ill" or "joint ill") is an infection of the umbilical vein that represents a significant cause of neonatal morbidity and mortality in camelids (llamas, alpacas, vicunas, guanacos) and cervids (deer, elk, moose, caribou). This condition occurs when bacteria enter through the umbilical stump and ascend via the umbilical vein toward the liver, potentially causing septicemia, liver abscesses, and secondary infections of multiple organ systems including joints, meninges, and lungs.

In camelids, newborns are called crias, while young cervids are typically called fawns (deer) or calves (elk, moose). Both groups share similar umbilical anatomy and susceptibility to navel infections, making understanding of this condition essential for NAVLE preparation.

Umbilical Cord Anatomy

The umbilical cord serves as the vital lifeline between dam and fetus during gestation. Understanding the normal anatomy is essential for recognizing pathology. In camelids and ruminants (including cervids), the umbilical cord contains five structures: two umbilical veins (which merge before entering the liver), two umbilical arteries, and the urachus.

Umbilical Structures and Their Fates

Species-Specific Considerations

Camelidae (Llamas and Alpacas)

South American camelids have unique characteristics relevant to umbilical health. Gestation length averages 345 days (+/- 14 days) for llamas and 330 days (+/- 10 days) for alpacas. Notably, greater than 90% of camelid births occur between sunrise and mid-day, an evolutionary adaptation to the harsh Andean climate that allows crias to dry before nighttime temperatures drop.

In camelids, umbilical infections are relatively uncommon compared to calves, likely due to differences in husbandry and cleaner birthing environments on many farms. However, when infections do occur, camelids and foals tend to become much sicker than calves with umbilical infections, often presenting at a younger age with more severe systemic illness.

Cervidae (Deer, Elk, and Related Species)

Cervids share similar umbilical anatomy with domestic ruminants. Farmed cervids (such as white-tailed deer, elk, and red deer) are increasingly common, making knowledge of neonatal care important. Fawns and elk calves are particularly vulnerable to umbilical infections in intensive farming operations where environmental contamination is higher than in free-ranging populations.

Etiology and Pathogenesis

Omphalophlebitis develops when bacteria colonize the umbilical stump and ascend through the umbilical structures. The umbilical cord, after separation from the placenta, essentially creates an open wound with direct access to the bloodstream. Until the cord dries and the umbilical ring closes (typically within 7-14 days), bacteria can easily enter.

Common Bacterial Pathogens

Risk Factors for Omphalophlebitis

• Failure of Passive Transfer (FPT): Inadequate colostrum intake is the single most important risk factor. Neonates with low IgG levels lack the immunological defense to combat umbilical pathogens.
• Unsanitary Birthing Environment: Dirty, wet, or overcrowded calving/cria areas increase bacterial contamination of the umbilical stump.
• Inadequate Navel Care: Failure to properly dip or disinfect the umbilicus after birth allows bacterial colonization.
• Primiparous Dams: First-time mothers may have reduced mothering ability, leading to delayed nursing and increased environmental exposure.
• Prolonged or Difficult Birth: Dystocia increases stress and may result in weakened neonates with compromised immunity.
• Short Umbilical Cord: Backward deliveries or cesarean sections may result in short navels that are more susceptible to infection.

Clinical Signs and Presentation

Clinical presentation varies depending on the age of the neonate, extent of infection, and structures involved. External signs may be absent even with severe internal infection, making thorough examination essential.

Local Signs (Umbilicus)

• Enlarged, thickened umbilical stump (should be finger-width by 1 week of age)
• Heat, swelling, and pain on palpation
• Purulent or foul-smelling discharge
• Moisture or failure to dry (wet navel beyond 24-48 hours)
• Urine dribbling from umbilicus (indicates patent urachus)

Systemic Signs

• Fever (or hypothermia in severe sepsis)
• Lethargy, depression, weakness
• Decreased or absent suckle reflex
• Anorexia, poor weight gain, failure to thrive
• Swollen, painful joints (septic arthritis/joint ill)
• Respiratory distress (secondary pneumonia)
• Neurological signs (meningitis: hyperesthesia, rigidity, seizures)
• Diarrhea, colic, signs of peritonitis

Diagnosis

Physical Examination

Deep palpation of the umbilical region is essential and is best performed with the neonate in lateral or dorsal recumbency. Palpate for enlarged umbilical arteries coursing caudally toward the bladder, and the umbilical vein coursing cranially toward the liver. A painful response to palpation caudal to the xiphoid may indicate peritonitis associated with infected umbilical structures.

Ultrasonography

Ultrasonography is the gold standard for diagnosis, allowing visualization of internal umbilical structures that may appear normal externally. A 7.5-MHz transducer is typically used. Normal umbilical structures are difficult to visualize after 1 week of age.

Laboratory Evaluation

• Complete Blood Count (CBC): Neutrophilia with left shift (or neutropenia in severe sepsis); toxic changes in neutrophils
• Serum Chemistry: Hypoglycemia, hyperfibrinogenemia, hypoalbuminemia
• IgG Assessment: Evaluate passive transfer status; levels less than 400 mg/dL indicate failure of passive transfer
• Blood Culture: Identify causative organism; guide antibiotic selection
• Umbilical Culture: Sample purulent material if draining; identify bacteria and sensitivities

Treatment

Treatment of omphalophlebitis may be medical, surgical, or both, depending on the severity and extent of infection. Early, aggressive intervention is critical as neonates can deteriorate rapidly.

Medical Management

Medical therapy alone may be appropriate when infection is confined to the external umbilical remnant and there are no signs of sepsis. However, exclusive medical management carries risk of serious complications such as septic arthritis.

Treatment Duration: Antibiotics should be administered for a minimum of 2-3 weeks. Follow-up ultrasound examinations and CBC with fibrinogen are useful to determine when to discontinue therapy.

Supportive Care

• IV Fluid Therapy: Correct dehydration and support perfusion
• Plasma Transfusion: For failure of passive transfer (15-25 mL/kg)
• NSAIDs: Anti-inflammatory and analgesic (flunixin meglumine 1.1 mg/kg)
• Nutritional Support: Ensure adequate caloric intake; tube feeding if needed
• Thermoregulation: Keep neonate warm and dry

Surgical Management

Surgical intervention is recommended when sepsis is identified, when the condition worsens despite antimicrobial treatment, or when there is substantial abscessation or venous involvement. Surgery involves omphalectomy (removal of infected umbilical structures).

• Umbilical Vein Infection: If infection extends to the liver, marsupialization (creating a drainage tract) may be necessary as complete excision is not possible
• Urachal Infection: Resection of infected urachus with partial cystectomy (bladder apex removal); close bladder in 2 inverting layers
• Umbilical Artery Infection: Resection above infected area; ligate arteries near bladder

Prognosis

Prevention

Prevention is far more effective and economical than treatment. A comprehensive prevention program focuses on three key areas: colostrum management, environmental hygiene, and proper navel care.

Colostrum Management

Ensuring adequate passive transfer of immunity is the single most important factor in preventing neonatal infections including omphalophlebitis.

• Timing: First colostrum feeding within 2-6 hours of birth (gut closure begins at 12-24 hours)
• Quantity: 10-15% of body weight in first 24 hours
• Quality: IgG greater than 50 g/L or Brix greater than 22%
• Cleanliness: Low bacterial contamination in stored colostrum
• Assessment: Check IgG status at 24-48 hours; serum total protein greater than 5.5 g/dL suggests adequate transfer

Environmental Hygiene

• Maintain clean, dry, well-bedded birthing areas
• Avoid overcrowding in maternity pens
• Remove soiled bedding between births
• Separate primiparous dams who may have poor mothering ability

Navel Care Protocol

Proper navel dipping is a critical but often neglected component of neonatal care. The goal is to disinfect the umbilical stump and promote drying to prevent bacterial entry.

Navel Dipping Technique

• Dip as soon as possible after birth (once neonate is breathing well)
• Use disposable cup or non-return container with 1-2 oz of solution
• Immerse entire umbilical cord up to the abdominal wall
• Hold cup against abdomen and gently shake for 10-15 seconds
• Repeat dipping 2-3 times in first 24 hours
• Discard used solution to prevent disease transmission