Hi I understand your concerns but do not worry. Many viral infections or exanthems can lead to such symptoms in toddlers. But a complete clinical evaluation to rule out bacterial infection is necessary. I would recommend you to go for a repeat clinical evaluation. Lab tests such as complete blood counts, C reactive protein and chest X Ray will be of help. If viral then the illness is self limiting. It will improve by good rest, hydration, nutrition and antipyretics for fever if needed. If bacterial, then an antibiotic course will be required as per reports. Take care