Disease-causing microbes have a negative impact on the body.
Dangerous microbes are called pathogenic or disease causing.
Pathogens have a negative impact on the body, causing disease.
Pathogens have what impact on the body?

(1) Roundworms
(2) small
(3) viruses
(4) insignificant
(5) Roundworms.
(6) toxins
(7) positive
(8) negative