Certain viruses have a brief lifespan within vectors that transfer them from infected plants to healthy ones. These viruses exhibit specific characteristics when transmitted, such as an inability to infect the vector’s progeny or pass through its moult. They appear to attach to the stylets externally, without multiplying within the vector or appearing in the haemolymph. Hungry vectors are more likely to acquire these viruses after a short acquisition feeding period, and they have a low transmission threshold period. However, it is important not to classify these additional characteristics as definitive criteria for labeling these viruses as “non-persistent.”