Il rapporto costi/benefici del tampone dopo la notifica dipende molto dall'efficienza del sistema.

Per riassumere l'idea in parole povere: il tampone sarebbe svantaggioso sia se il sistema fosse molto efficiente (poco utile) che se fosse molto inefficiente (troppo costoso). 1/5
Per chiarire:
Costi = quarantena (costo umano ed economico), tamponi (risorsa finita)
Benefici = contagi prevenuti

Il tampone a tutti i contatti serve a ridurre i costi (quarantena dei contatti) e a fermare contagi nella generazione successiva. 2/5
Ma al contempo, aggiunge costi (quarantena dei contatti dei contatti, per cui un tampone non sarebbe disponibile, sostanzialmente per il paradosso di San Pietroburgo).

3/5
E se la generazione successiva non e' ancora stata infettata (caso efficiente) o se la generazione successiva ha gia' contagiato (caso inefficiente), i benefici sono marginali. 4/5
C'e' certamente un regime in cui il tampone dopo i contatti serve:
e' un regime intermedio in cui il sistema non e' molto efficiente ma i tamponi sono abbondanti.

E' complicato valutare se siamo in quel regime senza fare un'analisi seria.
In Italia al momento penso di no. 5/5

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More from @LucaFerrettiEvo

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Understanding timing of COVID-19 transmission is key to inform good models and to choose appropriate interventions and public health policies.
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