FREE COMPREHENSIVE COURSEGeneral Microbiology Course

The easier, more reliable way to learn and comprehend exactly what you need to know to feel confident on your exams and boards.


Microbiology is challenging. Learning it doesn’t have to be.

Confused or overwhelmed by lectures and overly complex textbooks? If so, you’re not alone. That’s why the team behind First Aid created the high-yield Rx Bricks General Microbiology Course to be concise, interactive, and easy to understand and apply.

Gain a comprehensive understanding of Microbiology—faster and easier than ever. We intentionally break down microbiology’s need-to-know topics into digestible Bricks with interactive illustrations, mnemonic devices, clinical correlations, and case studies. This means you can absorb critical information more easily, apply what you’re learning to real-world scenarios, and ace your exams with confidence.


Covering Every Concept You Need To Know

  • 47 Multimedia lessons called “Bricks”
  • Hundreds of Interactive Flashcards & Images
  • 200 Built-In Practice Questions
  • Outlined Learning Objectives and Summaries for Each Brick
  • Integration with USMLE-Rx and First Aid*

High-Yield Content

Each Brick contains an at-a-glance Summary of the most essential information. Plus, measurable Learning Objectives at the beginning and end of each brick help you track your progress. And most can be covered in 20 minutes.


Interactive Flashcards

Reinforce your learning with interactive flashcards that help you retain more information.


Interactive Images

Quiz yourself as you learn using detailed, interactive images incorporated throughout each Brick.


Built-In Practice Questions

At the end of each Brick, challenge yourself with built-in review questions. Each item explains exactly why the answer is correct and why the other choices are incorrect.


Course Overview

Close your learning gaps and deepen your understanding.

Prokaryote Structure and the Gram Stain 21 min
Normal Flora 17 min
Bacterial Genetics and Virulence Factors 17 min
Exotoxins and Endotoxins 15 min
Gram-Positive Bacteria: Foundations and Frameworks 18 min
Staphylococci 21 min
Streptococci 26 min
Bacillus 16 min
Clostridia 15 min
Listeria monocytogenes 10 min
Nocardia and Actinomyces 14 min
Gram-Negative Bacteria: Foundations and Frameworks 21 min
Escherichia coli and the Enterobacteriaceae 17 min
Pseudomonas and Acinetobacter 17 min
Salmonella and Shigella 15 min
Yersinia enterocolitica, Campylobacter jejuni, Vibrio cholerae, Helicobacter pylori 21 min
Bordetella pertussis and Legionella pneumophila 16 min
Neisseria meningitidis and Haemophilus influenzae 21 min
Health Care–Associated Infections 17 min
Zoonotic Bacteria 14 min
Virology: Foundations and Frameworks 19 min
DNA Viruses: Foundations and Frameworks 14 min
Cytomegalovirus and Epstein-Barr Virus 18 min
Varicella Zoster Virus 17 min
RNA Viruses: Foundations and Frameworks 15 min
Influenza Virus and Respiratory Syncytial Virus 14 min
Viruses Causing Measles, Mumps, and Rubella 18 min
Human Immunodeficiency Virus 14 min
Parasitology: Foundations and Frameworks 16 min
Helminths 18 min
Protozoa and Ectoparasites 17 min
Fungi: Foundations and Frameworks 20 min
Antibacterial Drugs: Foundations and Frameworks 17 min
Antibacterial Drug Resistance 16 min
Penicillins 15 min
Cephalosporins, Vancomycin, and Bacitracin 14 min
Fluoroquinolones 19 min
Sulfonamides and Trimethoprim 16 min
Protein Synthesis Inhibitors 24 min
Drugs to Treat Tuberculosis 16 min
Antiviral Drugs: Foundations and Frameworks 15 min
Drugs to Treat Hepatitis B and C Infections 11 min
Drugs to Treat Herpesvirus Infections 14 min
Drugs to Treat Influenza Virus and Respiratory Syncytial Virus Infection  9 min
Drugs to Treat and Prevent HIV Infection 13 min
Drugs to Treat Protozoal and Helminthic Infections 17 min
Drugs to Treat Fungal Infections 18 min

Great! So how does it work?


Sign up to create your free USMLE-Rx account.


Select your free course in Rx Bricks and start studying today.


Download our mobile app so you can enjoy learning anywhere.


Your Free Account Brings Added Benefits that Never End

  • Unlimited access to the comprehensive General Microbiology Course in Rx Bricks
  • Unlimited access to the comprehensive Cellular and Molecular Biology Course in Rx Bricks
  • Unlimited access to Rx Bricks collections developed by MeSAGE (Medical Student Alliance for Global Education), covering critical issues such as health equity, diversity and inclusion, and the student as educator—with more coming soon
  • Unlimited access to more than 150 free high-yield, patient-centered learning Bricks from all 15 Rx Bricks collections, including the special COVID-19 module
  • Unlimited access from your desktop, tablet, or mobile device
  • Plus, get a free trial to our comprehensive study suite, Rx360+, with your free account

Learn anytime, anywhere. Even on the go.

Our easy to use app enables you to learn, review and assess your way through our comprehensive General Microbiology Course—anytime, anywhere.

Download the apps for free.

See what students are saying about the comprehensive courses in Rx Bricks:

“I usually find myself wanting to know more detail from the entries in First Aid and I’m usually always able to find the explanations in Bricks [courses]. The diagrams are excellent; they really help me visualize the concepts. The questions at the end are excellent to help test my understanding. Overall, I would recommend Bricks [courses] to my classmates because it’s easy reading and only the most pertinent information is left in, rather than textbooks which lose me with too much information.”

“It’s very well organized. And daunting topics are created in a very easy way to learn—and quickly!”

“It is the best. So much valuable information. Bricks is a concoction of Harrison, Robbins, Goodman & Gilman, Grey’s and many more books which I don’t have to spend hours reading because Bricks has made it so easy. I’ve started to love studying…which is a big achievement in itself.”

“It’s short, crisp and clear. No nonsense stuff, absolutely high yield. Love it.”

“Rx Bricks are amazing! They are organized so that, even if you don’t remember anything on a certain topic, you will be able to refresh your memory, fill in any gaps, and expand on the knowledge you already have. Having videos and links to the First Aid pages is unmatched. And finally, being able to look at flash cards and take practice questions on the covered topic, solidifies the information in your mind.”

“Rx Bricks remains the easiest to understand collection of high yield concepts for the USMLE exams I’ve come across.”

“Those who are just starting their journey for USMLE Step 1, I do highly recommend this because First Aid is an absolute essential, but oftentimes it gets quite boring and difficult to understand. First Aid tends to give information in a very few lines which sometimes needs more. So at that point, for strong basic understanding [Rx Bricks] is quite a great help. In addition to that, it provides audio clips and different histological and specimen images that often show up in examination.”


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