What is the invasion and growth of germs in the body known as?

The term that describes the invasion and growth of germs in the body is "infection." This process occurs when harmful microorganisms, such as bacteria, viruses, fungi, or parasites, enter the body, multiply, and trigger an immune response. Infections can manifest in various forms, from localized issues, such as a wound infection, to systemic problems, like sepsis, which can affect the whole body.

The other terms in the question refer to different concepts. Infestation typically pertains to the presence and growth of larger parasites such as mites or lice rather than microorganisms. Inflammation, on the other hand, is the body's response to injury or infection, characterized by redness, heat, swelling, and pain, but does not directly refer to the germs themselves. Invasiveness describes a characteristic of pathogens that allows them to spread, but it doesn't encompass the overall process of germ growth and its effects within the body as "infection" does. Understanding these distinctions is crucial in the field of health and wellness, especially in contexts such as waxing and skincare, where prevention of infection is essential.