Prevalence is the share of sequenced isolates in a country-year carrying at least one gene of the selected drug class. Pick a class, drag the year slider or press play; click a country for its numbers.

Source: NCBI Pathogen Detection — the open per-isolate metadata tables (AMR_genotypes, the precomputed AMRFinderPlus gene calls, plus collection_date, geo_loc_name, scientific_name). No assemblies are downloaded and AMRFinderPlus is not re-run — we ingest NCBI's own calls.

Read this honestly:

• Two organisms carrying the same gene is co-occurrence, not proof of transfer between them — horizontal gene transfer needs plasmid/phylogenetic analysis this view does not do.
• Sampling is heavily surveillance-biased: the US and Europe sequence far more isolates, so a dark country may mean more surveillance, not more resistance. Country-years with fewer than 5 sequenced isolates are greyed.
• A gene's presence is a genotype, not a phenotype — carriage does not guarantee clinical resistance.
• Scope is NCBI's foodborne + healthcare pathogen panel, not all bacteria.

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