Answer:
Delusions; positive
Step-by-step explanation:
Schizophrenia is a mental health disorder in which an individual's thought pattern, behaviour and emotions are distorted. The individual often loses touch with reality. Someone having schizophrenia often witness any or a combination of the following symptoms such as hallucination, disorganized speech, impaired motor behavior, delusions.
Delusion is a positive symptom of schizophrenia, which involves the individual having an unrealistic belief that they are very important and as such some certain persons are after them to hurt them.
David's beliefs are examples of delusions that are considered positive symptoms of schizophrenia.