Description
This mod creates procedurally generated infectious diseases that give each player a unique molecular code, symptom list, strength level, and specific antibiotic weakness, displays the active disease on the action bar, and applies effects from slowness, weakness, nausea, hunger, blindness, mining fatigue to strong poison. Diagnose and treat infections by crafting a Cotton Swab to sample players, mobs, or new Hazmat Researcher NPCs and placing a Microscope block to open an interactive UI showing the disease’s molecular structure, symptoms, strength, and antibiotic comparison; three craftable antibiotics (Alpha, Beta, Gamma) cure matching infections and permanently immunize you to that molecular strain, while potions and wrong drugs can mutate or change disease strength. New Hazmat Researchers spawn naturally wearing sealed protective gear and carry sealed disease samples you can safely sample to learn their disease details without risk of them infecting others, and you can craft a full Hazmat armor set to prevent both catching and transmitting diseases; discovered diseases can be named and saved to a world library for sharing and study.
Mod Wiki
Microscope Plague Lab
Quickstart
- Craft a Cotton Swab (white wool + stick at a crafting table) and use it on yourself to generate your unique procedural disease.
- Craft a Microscope block and place it down. Interact with it to open the diagnosis UI — this shows your disease's name, molecular code, symptoms, strength, and which antibiotic will cure it.
- Craft the matching antibiotic (Alpha, Beta, or Gamma) and use it to cure the infection and gain permanent immunity to that disease strain.
- To stay safe while exploring, craft and equip the full Hazmat armor set (Helmet, Chestplate, Leggings, Boots) to block both catching and spreading diseases.
Overview
Microscope Plague Lab transforms Minecraft into a disease-management survival experience. Every player can contract a procedurally generated infection with a unique molecular code, symptom set, strength level (1–6), and a specific antibiotic weakness. Diseases spread between players and mobs, apply debilitating status effects, and can mutate. Your job is to diagnose, treat, and immunize — or protect yourself entirely with hazmat gear.
Diseases discovered and named by players enter a shared world library and can begin circulating naturally, creating a living, evolving epidemic ecosystem across your world.
What It Adds
| Content | Description |
|---|---|
| Cotton Swab | Samples you, other players, mobs, or Hazmat Researchers to assign or read a disease |
| Microscope (block) | Interactive UI for diagnosing active diseases |
| Disease Sample | Craftable item to procedurally generate a new infection |
| Antibiotic Alpha / Beta / Gamma | Three cures, each effective against one molecular weakness type |
| Hazmat Helmet / Chestplate / Leggings / Boots | Full armor set that prevents catching and transmitting diseases |
| Hazmat Researcher (NPC) | Naturally spawning villager-like entity wearing protective gear and carrying a sealed disease |
How To Use
Getting Infected
You can catch a disease through several routes:
- Using a Disease Sample on yourself procedurally generates an infection.
- Transmission from infected players or mobs (blood or proximity contact).
- World exposure events, which may infect unprotected players with a random or player-discovered disease from the world library.
When infected, the disease name appears on your action bar. Depending on disease strength, you will suffer escalating status effects: slowness, weakness, nausea, hunger, blindness, mining fatigue, and at maximum strength, strong poison.
Diagnosing
- Craft a Cotton Swab and use it on the target (yourself, another player, a mob, or a Hazmat Researcher) to sample the disease.
- Interact with a placed Microscope block to open the diagnosis UI.
- The UI displays: disease name, discoverer (if named), molecular code, symptoms, strength level, and which antibiotic type matches the weakness.
Treating
- Identify the correct antibiotic (Alpha, Beta, or Gamma) from the Microscope UI.
- Craft and use the matching antibiotic to cure the infection instantly.
- Curing permanently immunizes you to that exact molecular strain — you cannot catch it again.
- Using the wrong antibiotic or certain potions can mutate the disease or change its strength, so always diagnose first.
Naming and Sharing Diseases
After diagnosing your infection at the Microscope, you are given the option to name the disease (up to 28 characters). Named diseases are saved to the world disease library (holds up to 40 entries) and begin circulating — other players can catch your named disease through normal transmission and world exposure. A server-wide message announces every new named discovery.
Hazmat Researchers
Hazmat Researchers spawn naturally in village biomes, wandering in sealed protective gear. They always carry a disease but cannot infect others due to their containment. Use a Cotton Swab on a Researcher to safely sample their disease and study its details at the Microscope — no risk of catching it. You can also use a Hazmat Researcher Spawn Egg to place one manually.
Crafting And Obtaining
Cotton Swab


Disease Sample


Microscope


Antibiotic Alpha


Antibiotic Beta


Antibiotic Gamma


Hazmat Helmet


Hazmat Chestplate


Hazmat Leggings


Hazmat Boots


Abilities And Mechanics
Disease Properties
Each procedurally generated disease has four fixed properties:
| Property | Details |
|---|---|
| Name | Auto-generated (e.g. Viro-347, Myco-812) or player-named |
| Molecular Code | Unique identifier string (e.g. A-3-spiral-2) |
| Symptoms | Three drawn from: chills, coughing, fatigue, fever, dizziness, muscle ache, blurred vision, migraine, stomach cramps, shaking hands |
| Strength | 1–6; determines severity of applied effects |
| Weakness | Alpha, Beta, or Gamma — only the matching antibiotic cures it |
Status Effects by Strength
Strength scales from mild debuffs (slowness, weakness) at low levels up to nausea, hunger, blindness, mining fatigue, and strong poison at high strength.
Antibiotic Structures
The Microscope UI compares your disease's molecular structure against each antibiotic's known lattice pattern to identify the correct treatment:
| Antibiotic | Structure |
|---|---|
| Alpha | △-CH3 red triangular lattice |
| Beta | ◎-OH blue ring lattice |
| Gamma | N≡N purple helix chain |
Hazmat Armor
Wearing the complete set (all four pieces) grants full immunity to both catching diseases from others and transmitting your own. Any missing piece breaks the protection. The armor is enchantable and has durability comparable to iron-tier equipment.
Mutation
Using the wrong antibiotic or certain potions on an active infection does not simply fail — it can mutate the disease, changing its strength or other properties. Always confirm the correct antibiotic type at the Microscope before treating.
Immunity
Curing a disease with the correct antibiotic permanently stores that disease's molecular code in your immunity list. You can accumulate immunity to up to 80 distinct strains. Immune players cannot be re-infected by a known strain even through direct transmission.
Progression And Strategy
Early game: Gather wool and a stick to craft Cotton Swabs immediately. Smelt some iron and copper to craft a Microscope as soon as possible — never take an antibiotic without checking the Microscope first.
Mid game: Locate Hazmat Researchers in villages to safely harvest disease data. Build up antibiotic stockpiles of all three types so you can treat infections quickly once identified.
Late game: Craft the full Hazmat armor set to work in infected areas or assist infected teammates freely. Systematically discover, name, and immunize yourself against as many strains as possible to become effectively immune to the world's circulating diseases.
Multiplayer tip: In a server setting, named diseases spread globally. Coordinate with other players to identify and catalog outbreaks, share antibiotic crafting responsibilities, and quarantine heavily infected players using hazmat gear until they are cured.
How to install
Download the mod and follow the step-by-step installation guide.
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This mod is licensed under the CreativeMode Mods License.




