**Bacteremia** is an illness marked by the presence of bacteria in the blood

Bacteremia

Bacteremia involving **pyogens** (pus-forming bacteria) is called **pyemia**.

Pyemia

When viruses are found in the blood, it is called **viremia**

Viremia

**Toxemia** is an illness that occurs when toxins are found in the blood.

Toxemia

**Septicemia** occurs when bacteria are **both** present **and** multiplying in the blood.

Septicemia

Once invasion is successful and pathogens gain access to the blood stream, they can cause various illnesses ending in **–emia**, including:
- Bacteremia
- Pyemia
- Viremia
- Toxemia
- Septicemia

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Once adhesion is successful, invasion can proceed. Invasion involves the wide spread of a pathogen throughout local tissues or the body. Pathogens may produce exoenzymes or toxins, which serve as virulence factors that allow them to colonize and damage host tissues as they spread deeper into the body. 

Invasion

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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