Which vaccine is now recommended for the immunization of all newborns?

The correct answer is choice A, E.

Choice A rationale:

Using an air conditioner is an effective way to reduce exposure to pollens and dust. Air conditioners filter the air and help prevent outdoor allergens from entering the indoor environment. This choice is correct because it addresses one of the primary sources of exposure to allergens.

Choice B rationale:

Keeping humidity in the house above 60% is not a recommended approach. High humidity can promote the growth of mold and dust mites, which can exacerbate allergies. Maintaining humidity levels between 30-50% is generally recommended for reducing allergen exposure.

Choice C rationale:

Keeping pets outside might seem like a logical option to reduce allergen exposure; however, pet allergens can still be carried indoors on clothing and shoes. Moreover, if individuals are not allergic to pet dander, keeping the pets inside may not pose an issue.

Choice D rationale:

Replacing wall-to-wall carpeting with wood and tile floors is a good strategy for reducing allergen exposure. Carpets can trap dust, pollen, and other allergens, while hard surfaces are easier to clean and do not accumulate allergens as readily. This choice is correct because it addresses a common source of indoor allergens.

Choice E rationale:

Putting dust-proof covers on pillows and mattresses is another effective strategy for reducing allergen exposure. These covers create a barrier that prevents dust mites and their allergens from permeating the sleeping environment. This choice is correct because it directly addresses the issue of dust mite allergens.

The correct answer is choice A. Infection or inflammation close to the site.

Choice A rationale:

Tender, enlarged, and warm lymph nodes are indicative of infection or inflammation in the nearby area. Lymph nodes are part of the immune system and can become enlarged and tender when fighting off infections in their drainage area.

Choice B rationale:

While cancer can cause lymph node enlargement, it is less likely in children, and the question doesn't provide any other context to suggest cancer as the primary explanation.

Choice C rationale:

Local scalp infection might cause enlargement of the lymph nodes in the neck, but it would not be the best explanation for tender, enlarged, and warm cervical lymph nodes. Infections or inflammation close to the site of lymph node involvement are more likely.

Choice D rationale:

Infection or inflammation distal to the site wouldn't directly explain the tenderness, warmth, and enlargement of the cervical lymph nodes. Lymph nodes generally react to infections or inflammation in their drainage area.