Which ear infection viruses or bacteria will surely cause ear infections in a child's playmates?

Not contagious. Ear infections are not contagious. Oftentimes, a baby or toddler has a an accompanying cold when having an ear infection. The cold is contagious to another child and that adds a risk of developing an ear infection.
Neither. There is no statistical basis proving that bacteria or viruses absolutely trigger more ear infections in contacts. Having said that, ear infections are generally considered bacterial in origin, either primary or secondary. That is why antibiotis are often used.

Related Questions

My 2.5 yr baby has ear infection. How do symptoms differ between bacterial & viral; would antibiotic help just bacterial, &viral resolves on its own?

Ear infections. Antibiotics cure susceptible bacterial infections. They do not do anything to viruses. Many children with ear infections will heal well without antibiotics. This is something to discuss with the pediatrician--the child's age, general state, and access to medical care all come into play in making treatment decisions.
Ear infections. Symptoms of ear infections (fever, pain etc) can apply to both viral and bacterial causes. Antibiotics treat only bacterial causes and viral causes are self-limited and will go away on their own. There are times when the child isn't demonstrating symptoms and the pediatrician may see fluid behind the ear drum - that is very likely viral and antibiotics aren't warranted.

What is the first part of the brain affected by bacterial meningitis caused by ear infection?

Local spread. Ear infections can lead to abscess most commonly affecting the temporal lobe or if leading to meningitis can cause whole brain involvement. Depending on the bacteria type certain nerve (ie hearing nerves) may be affected more than others.

If you have a bacteria ear infection do you need treatment? Or can it go away on it's own?

Ear infection Rx. Although your immune system may be capable of getting rid of a bacterial infection, treatment with an appropriate antibiotic can clear the infection sooner, help you feel better faster and reduce the risk of complications.
Some self heal. In the years before antibiotics people had ear infections ; just toughed them out. It often took 6-8 weeks for the body to clear the infection. Pain control with heat, Ibuprofen or Acetaminophen can help. Some viral infections disappear in a few days without help. However, some infections can become chronic, abscess the bone near the ear and need to be surgically drained.

Can I use topical Clindamycin cream 4 outer ear infection? Will it be effective against pseudomonas, the probable bacteria? Will cream be ok for ear?

Probably not. It would be very hard to get the Clindamycin cream all the way into the full length of your ear canal, and Clindamycin is not usually the antibiotic of choice for outer ear infection. Please see your doctor for diagnosis and treatment.
Ciprofloxacin. Ciprofloxacin otic drops is the drug of choice for otitis externa related to pseudomonas. Other topical fluoroquinolones might work also.

How do you know if ear infection is viral or bacteria? Started with sore throat then runny stuffy nose

Viral otitis. The only way you can know for certain which type of infection is present, is by having the middle ear fluid sent for a culture. Usually, your doctor will be able to determine if you require specific treatment by the history or your symptoms and the physical findings.