Differential Diagnosis for Oatmeal Colored Stools Post Vaccination

• Single Most Likely Diagnosis
  • Intussusception: This condition is a known adverse event associated with certain vaccinations, such as the rotavirus vaccine. Oatmeal colored stools, also known as "currant jelly" stools, are a classic symptom of intussusception due to the presence of blood and mucus.
• Other Likely Diagnoses
  • Gastroenteritis: Post-vaccination, some individuals may experience gastrointestinal symptoms, including changes in stool color, due to a viral or bacterial infection.
  • Allergic Reaction: Certain vaccinations can cause an allergic reaction, which may manifest as gastrointestinal symptoms, including altered stool color.
• Do Not Miss Diagnoses
  • Intestinal Obstruction: Although less common, intestinal obstruction can cause changes in stool color and should be considered, especially if accompanied by severe abdominal pain, vomiting, or constipation.
  • Bleeding Disorder: Vaccinations can, in rare cases, trigger or exacerbate a bleeding disorder, leading to gastrointestinal bleeding and subsequent changes in stool color.
• Rare Diagnoses
  • Vaccine-Associated Vasculitis: A rare condition where the vaccination triggers an autoimmune response affecting blood vessels, potentially leading to gastrointestinal symptoms, including changes in stool color.
  • Immunodeficiency: Certain vaccinations can unmask underlying immunodeficiencies, which may present with recurrent infections, including gastrointestinal infections that could alter stool color.