My son used to have respiratory infection often, each time he coughed hard, and the peditrician in the clinic said it's mycoplasma. We were wondering what made him get the infection again and again. Then one day, he had high fever, it was pneumonia, so he was hospitalized. The medical team did bunch of tests, they said too mycoplasma, said the test is high something, so they gave him IV for a week or two. After going home, there was oral drug to take. However, they treated it thoroughly, so after that, my son hasn't had one more mycoplasma infection. What I'm trying to say is, maybe the previous one wasn't cured completely.