Q: Can a child get Mycoplasma pneumonia again in the same year?
Medically reviewed by Sang Hyun Ahn, MD
Content edited by Myeongchan Kim, MD
This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
Question:
My child had Mycoplasma pneumonia back in March, but they have recently started coughing again. Is it possible to get reinfected with Mycoplasma in the same year? I'm worried it might be back.
Answer:
Yes, it is entirely possible to be reinfected with Mycoplasma pneumoniae within the same year.
Why Reinfection Can Happen
Short-lived immunity: After recovering from a Mycoplasma infection, the body does produce antibodies; however, this immunity is temporary. It typically lasts only several months to about a year, meaning it does not provide lifelong protection.
Different strains: There are different strains of Mycoplasma bacteria, meaning a child can be exposed to a different subtype than the one they had previously.
Community exposure: During seasonal outbreaks or in group settings like daycares and schools, frequent exposure significantly increases the chance of reinfection.
Evaluating the Current Cough
If your child had an infection in March and has developed a new cough:
Reinfection is possible, but it is often more likely to be a standard viral upper respiratory infection (such as rhinovirus, RSV, or adenovirus).
Observe the pattern: A typical Mycoplasma infection often presents as a dry, hacking cough that gradually worsens and lingers for two weeks or more, frequently accompanied by an intermittent fever. Common colds usually peak within a few days and resolve more quickly.
Helpful Steps for Home Care
Hydration: Ensure plenty of fluids (warm water, broths) to soothe the airway and thin any secretions.
Humidification: Maintain indoor humidity levels between 40% and 60% with a cool-mist humidifier.
Track symptoms: Keep notes on the cough's characteristics (day vs. night, dry vs. productive with phlegm, and how many days it has lasted).
Monitor general condition: Watch for fever, breathing changes, appetite drops, and energy levels.
When to See a Pediatrician
Take your child to see a doctor for an in-person evaluation if you notice any of the following:
A cough that persists for more than two weeks or progressively worsens
A fever of 38°C (100.4°F) or higher that lasts longer than 3 days
Signs of respiratory distress, such as rapid breathing, wheezing, flaring nostrils, or chest pain
Severe nighttime coughing fits that disrupt sleep
A noticeable decrease in feeding, hydration, or typical activity levels
During an evaluation, a pediatrician can listen to your child’s lungs, and if necessary, order a chest X-ray or specific diagnostic tests to determine whether this is a recurrent Mycoplasma infection or a different respiratory illness.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
