Which of the following would not be as likely to be contracted bathing at a beach?

Bathing at a beach primarily involves exposure to surface water, which can host a variety of pathogens. Spinal meningitis, particularly the types caused by viruses or bacteria, is generally not a result of bathing in contaminated water. Instead, meningitis is more often transmitted through respiratory droplets or direct contact with an infected person. The pathogens that usually cause spinal meningitis are not typically associated with beach environments.

On the other hand, both leptospirosis and middle ear infections can be linked to environmental conditions found at recreational freshwater sites. Leptospirosis is caused by exposure to water contaminated with the Leptospira bacteria, which can enter the body through cuts or abrasions while swimming. Meanwhile, middle ear infections, while not directly caused by water, can occur after swimming or bathing when water gets trapped in the ear canal, leading to bacterial or viral growth.

Thus, spinal meningitis is less likely to be contracted from activities like bathing at a beach, making this choice the most appropriate answer.