The flu, caused by the influenza virus, typically presents with a combination of symptoms, including runny nose, sore throat, fever, cough, body aches, and fatigue.

Ear infections, also known as otitis media, are usually caused by bacterial infections. Common bacterial culprits include Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis.

Chickenpox, caused by the varicella-zoster virus, is known for its itchy rash of small, red bumps that appear in crops over the body.

The common cold, caused by various respiratory viruses, can spread through direct contact with an infected person, inhalation of airborne droplets, or touching contaminated surfaces and then touching the face.

Meningitis, an inflammation of the membranes surrounding the brain and spinal cord, typically presents with fever, headache, and stiff neck. It can be caused by bacterial or viral infections.

For uncomplicated cases of the common cold, rest and fluids are the primary recommendations. Antibiotics are not effective against viral infections, and over-the-counter cold medications may provide temporary relief but do not cure the cold.

Tonsillitis, an inflammation of the tonsils, is commonly caused by bacterial infections, particularly Streptococcus pyogenes (group A streptococcus).

Diarrhea, defined as loose or watery stools, is the most common symptom of gastroenteritis, an inflammation of the gastrointestinal tract often caused by viral or bacterial infections.

Croup, also known as laryngotracheobronchitis, is a respiratory infection that causes a barking cough, hoarseness, and difficulty breathing, primarily affecting young children.

For uncomplicated cases of gastroenteritis, oral rehydration therapy (ORT) is the primary treatment to prevent dehydration. ORT involves consuming a solution containing electrolytes and glucose to replenish lost fluids and minerals.

Scarlet fever is a bacterial infection caused by Streptococcus pyogenes (group A streptococcus). It is characterized by a fever, headache, and a rash of small, red spots that typically appears on the face and then spreads to the rest of the body.

Bacteria are the most common cause of pneumonia in children, with Streptococcus pneumoniae being the leading bacterial culprit. Viral pneumonia is also common, particularly in younger children.

Hepatitis A, B, and C are all viral infections that can affect the liver. Hepatitis A is transmitted through contaminated food or water, Hepatitis B through contact with infected blood or bodily fluids, and Hepatitis C through contact with infected blood.

For uncomplicated cases of measles, supportive care is the primary treatment. This includes rest, fluids, and pain relievers. Antiviral medications may be used in certain cases, but antibiotics are not effective against viral infections.

Polio, caused by the poliovirus, is a highly infectious disease that can lead to paralysis. Symptoms include fever, headache, stiff neck, and muscle pain. While the polio vaccine has largely eradicated the disease in many parts of the world, it remains a concern in some regions.