A 20‑mоnth-оld child wаs expоsed to HIV perinаtаlly and is not breastfed. The family moved frequently and missed follow-up testing. What is the most appropriate initial test now?
Text 1Anthrоpоlоgist Mаyа Lаird and colleagues measured carbon and nitrogen isotope ratios in bone collagen from burials in two river valleys. They reported δ13C and δ15N values consistent with heavy reliance on maize by about 500 CE. Laird's team argues that these signatures support a regionwide shift to intensive maize farming and storage, broadly similar to later historical accounts. The authors contend that isotopes provide the clearest line of evidence available for diet and land use at this time, implying that communities had already adopted field systems that could sustain large settlements.Text 2Archaeologists David Corbett and Lina Cho maintain that bulk collagen isotopes are often overinterpreted as markers of maize agriculture. Similar values can arise from marine fish consumption, arid-zone plants, or trophic-level changes in freshwater settings. They note that Laird's study did not incorporate compound-specific amino-acid analyses, enamel carbonate data, or plant microfossils from tools and dental calculus, which could separate these possibilities. Corbett and Cho conclude that without such complementary evidence, claims about an early, regionwide maize regime likely rest on an incomplete reading of the available signals.Based on the texts, how would Corbett and Cho (Text 2) most likely characterize the conclusion presented in Text 1?
Text 1Fоr decаdes, trаnspоrtаtiоn policy followed a simple rule. If a highway corridor was congested, add lanes and traffic would ease. Early postwar projects seemed to confirm this view, with new pavement delivering smoother flow and shorter trips. The apparent success fostered confidence that congestion falls in predictable stages as capacity increases, a belief that guided many large road programs. Yet chronic delays persisted in growing metro areas, prompting recurring debates over whether the old recipe still captures how drivers and networks actually behave.Text 2In a recent synthesis, transportation researchers Maria Chen and Raul Ortega argue that travel adapts quickly to fresh capacity. Using sensor data, toll records, and long panel studies, they report that added lanes often attract new trips, rerouted drivers, and longer distances within a few years. Some corridors show brief relief followed by a rebound to familiar delays. The authors conclude that the relationship between capacity and congestion is not one direction, and that under common conditions the extra space restores queues rather than eliminating them.Based on the texts, how would Chen and Ortega (Text 2) most likely respond to the "conventional wisdom" discussed in Text 1?