What is a primary method for detecting head lice?

Visual inspection of the scalp and hair is a primary method for detecting head lice. This procedure involves closely examining the hair and scalp for the presence of lice or their eggs (nits). A thorough inspection can reveal adult lice, which are typically about the size of a sesame seed and may appear to be moving, as well as nits, which are tiny, oval-shaped eggs that can be more difficult to see since they are often attached to the hair shafts close to the scalp.

While using a special comb can also help in detecting lice and is a common practice for removal, the initial diagnosis relies heavily on visual assessment. Other methods, such as applying a hair treatment, are typically employed after detection to eliminate the infestation. Similarly, checking for itching, although often associated with lice presence, is not a definitive method for diagnosis, as not everyone infested will experience itching. Therefore, the most effective and primary method for identifying head lice is through a visual examination.