Diatom Pathogen Guide

Pathogenic Diatom guide: co-op halves, July 22 solo mode, Remote Play Together tips, plasmid map, and when Diatom beats solo pathogens.

Diatom as Co-op Identity

Diatom is Pathogenic dual-body pathogen designed for local co-op and Steam Remote Play Together. Two players each control one half—movement, aim, and editor decisions split across the infection. Community lists rank coordinated Diatom S-tier in co-op and closer to B-tier for uncoordinated or early solo attempts.

July 22, 2026 post-launch update added true solo Diatom: press X on the pathogen select screen, wait briefly without a second input device, and one player controls both halves. That change made Diatom accessible without a partner while preserving co-op as the intended peak experience.

Diatom has a separate plasmid map from single-body pathogens. Invest in shared economy and half-sync nodes before exotic cosmetics so both halves stay relevant through Liver and Heart.

Co-op Roles and Communication

Assign roles before Skin: one half artillery Secretors, one half Helminth-like frontline Spikes or Nanobot-style thorns. Call T-cell beams, sync Overcharge bursts, and agree who opens Tab so party tempo does not stall in elite rooms.

Remote Play Together guests should confirm input mappings and achievement popups locally. Hosts carry seed and save state—read remote play together and save-continue guides before long sessions.

Minion-heavy Spore-style halves pair well with blocking or armor partners. Avoid both halves stacking identical Secretor spreads that waste Mitochondria adjacency.

Solo Diatom Mode Tips

Solo mode asks one brain to pilot two halves—expect higher cognitive load than Bacteria. Use simpler loadouts: one half movement and dodge focus, one half primary DPS, until muscle memory forms.

Controller plus keyboard hybrids work for some players; others prefer dual-stick on a single gamepad scheme documented in gamepad controls. Practice Skin clears before Antibiotics dailies.

July 22 also improved Lungs telegraphs and Ephemeral recycling—solo Diatom benefits because you cannot rely on a partner to grab nearly unused Ephemeral parts for resources.

When to Pick Diatom

Pick Diatom for co-op nights, dual-body achievements, and shared plasmid progression. Skip Diatom for first Brain speed attempts unless both players already clear Heart consistently on solo bodies.

Unlock requirements sit behind organ milestones—check pathogen unlocks after shared plasmid cost reductions. Cross-read co-op diatom, solo diatom mode, and steam achievements pages for related goals.

Embed co-op footage on this page shows dual-body motion; use it to set expectations before inviting a Remote Play guest.

Frequently Asked Questions

Can I play Diatom solo?

Yes after the July 22 update—select Diatom and press X, then wait for solo mode to engage.

Is Diatom good without voice chat?

Possible but harder. Text pings and role agreement before the run help.

Does Diatom share plasmids with Bacteria?

Diatom uses a separate plasmid map. Account-wide unlock gates still benefit from shared cost reductions.