Management of Recent Primary Dengue Infection with Gastrointestinal Symptoms

Diagnostic Interpretation

The serologic pattern of IgM positive, IgG negative, and NS1 negative indicates a recent primary dengue infection where the specimen was collected more than 7 days after symptom onset, after the NS1 antigen has cleared but antibodies have developed 1
NS1 antigen typically becomes undetectable after 10 days of illness, while IgM antibodies appear 3-5 days after symptom onset and can persist for months 1, 2
The negative IgG confirms this is a primary infection rather than secondary dengue, which carries different risk profiles for severe disease 3
Confirmatory plaque reduction neutralization testing (PRNT) should be performed if available to definitively distinguish dengue from other flavivirus infections, particularly in areas with co-circulating Zika virus 4, 1

Inability to maintain adequate oral hydration due to vomiting is a key factor in hospitalization decisions for dengue patients, as recommended by the American College of Physicians 1

Serum albumin and renal function tests should be obtained urgently in patients with suspected dengue infection 2
Blood glucose levels should be monitored in patients with dengue infection 3

Aggressive intravenous fluid replacement is the cornerstone of treatment for dengue patients, with careful titration based on hematocrit monitoring, urine output, and vital signs, as recommended by the World Health Organization 1
Vital signs should be monitored every 1-4 hours depending on severity, and urine output should be maintained at >0.5 mL/kg/hour 1
Antiemetics should be used for vomiting control, and nothing by mouth if severe vomiting; advance diet as tolerated, as recommended by the Centers for Disease Control and Prevention 1
Monitor for hypoglycemia, particularly in children, as advised by the American Academy of Pediatrics 1

Do not assume the infection is resolving based on negative NS1 - the patient may still be in or entering the critical phase where complications occur, as warned by the World Health Organization 1

This patient presenting with IgM+/NS1- is likely in the late febrile or early critical phase, the period of highest risk for complications, according to the Centers for Disease Control and Prevention 1, 1