Pathogenic Game Pathogens

Do not chase unlocks before you understand grafting

Pathogen choice matters less than organelle synergy for your first five runs. Read how organelles slot together, then return here to specialize. The beginner guide walks the full first-run loop if you have not cleared Skin yet.

Once you can reliably reach a mid-organ boss, the roster table below becomes the reference you keep open between attempts.

Bacteria — the teaching pathogen

Bacteria’s body is compact enough to read in the organelle editor on a first run. You can attach a secretor for range, a spike for melee defense, and one mitochondria without fighting awkward slot angles. Most community “first clear” routes assume Bacteria plasmids that add a stash slot and one extra mutation choice.

Helminth and Spore — opposite combat poles

Helminth wants you in the immune cell’s face: spikes delete projectiles and knock enemies back, which pairs with phagocytosis challenge mode later. Spore instead floods the room with minions; its power spikes when mitochondria overcharge spawn rates. If you dislike positioning, start Spore only after you understand flagella pacing.

Amoeba and Nanobot — body shape specialists

Amoeba rewards dragging organelles around freely — repositioning a secretor behind a spike changes reach and mass in ways other pathogens cannot. Nanobot is the opposite: stack armor cores, absorb mistakes, and win boss DPS checks through sustained overcharge rather than dodging every bullet.

Protozoa and Virus — unlock-tier carry picks

Protozoa becomes one of the strongest speed runners once its dash plasmids are online; until then it feels fragile in Lungs airflow rooms. Virus is the secretor playground — infusers chain farther on its frame, but you need prior clears to unlock it and feed its tree.

After you pick a main, compare graft targets on the builds page and ranked parts on the organelles tier list.

Fragments are pathogen-locked

Dying as Amoeba still banks fragments for Amoeba only. Many players finish Bacteria’s first horizontal row before investing heavily in a specialty pick. Full node maps and farming order live on the plasmid tree guide.

Starting unlocks inside the tree

Several pathogens hide alternate starting organelles behind plasmid nodes — not just stat bumps. Check the codex after each purchase; some nodes swap your default weapon entirely, which changes early-room tempo more than a raw +10% damage line.

Once a tree row is funded, co-op or Diatom runs become the fastest way to test new nodes without risking solo streaks — covered next.

When Diatom beats solo pathogens

Diatom shines when you want to experiment with oversized builds that would tip a solo body’s mass too far — one half can carry three secretors while the other handles mitochondria and flagella. Detailed duo strats are on the co-op guide.

When to stay on solo species

Unlock achievements and most plasmid fragment farms still route through the seven solo pathogens. Use Diatom for practice and fun duos, not for your first account-wide unlock push.

If co-op is not your plan, the unlock checklist below finishes the roster faster.

Order most players use

Bacteria clear → Helminth or Spore for variety → Amoeba when you understand the editor → Nanobot when armor systems make sense → Protozoa when Lungs airflow is familiar → Virus last. Skipping straight to Virus without plasmid health is a common stall point.

Cross-links for the grind

Organ routing for Lungs and Antibiotics settings sits in the walkthrough. Boss checkpoints that drop extra fragments are listed under bosses. When the roster is complete, move to builds for pathogen-specific combos.