This proverb/idiom is apt in this context.

It means extreme caution is called for. Go ahead with care.

एहतियात बरतो, सावधानी बरतो, etc.

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एहतियाती दृष्टिकोण अपनाएं

English term (edited): adhere to the precautionary approach

In the given context, this should be the most relevant meaning because the term 'precautionary' means the 'preventive action' which may be taken till a complete scientific proof is obtained and the 'approach' means the policy to be adopted. The term 'adhere' means to follow or to comply with.

In medical field, it would mean रोगनिरोधक/रोगनिवारक नीति का पालन करें.

(Ref: The English-Hindi Hindi-English Thesaurus by Arvind Kumar)
Precautionary principle
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The precautionary principle is a moral and political principle which states that if an action or policy might cause severe or irreversible harm to the public or to the environment, in the absence of a scientific consensus that harm would not ensue, the burden of proof falls on those who would advocate taking the action.[1] Rephrased: There is a responsibility to intervene and protect the public from exposure to harm where scientific investigation discovers a plausible risk in the course of having screened for other suspected causes. It becomes appropriate to relax these protections that mitigate this suspected risk only if further scientific findings emerge that even more robustly eliminate the original risk theory in favor of a successor rival explanation. In some legal systems, as the European Union Law, the precautionary principle is also a general principle of law. This means that it is compulsory.[2] The principle aims to provide guidance for protecting public health and the environment in the face of uncertain risks, stating that the absence of full scientific certainty shall not be used as a reason to postpone measures where there is reasonable grounds for suspecting the risk of serious or irreversible harm to public health or the environment.

There are many definitions of the precautionary principle. Precaution is caution in advance, ‘caution practised in the context of uncertainty’, or even more succinctly, informed prudence. All definitions have two key elements.

an expression of a need by decision-makers to anticipate harm before it occurs. Within this element lies an implicit reversal of the onus of proof: under the precautionary principle it is the responsibility of an activity proponent to establish that the proposed activity will not (or is very unlikely to) result in significant harm.
the establishment of an obligation, if the level of harm may be high, for action to prevent or minimise such harm even when the absence of scientific certainty makes it difficult to predict the likelihood of harm occurring, or the level of harm should it occur. The need for control measures increases with both the level of possible harm and the degree of uncertainty
No introduction to the precautionary principle would be complete without brief reference to the difference between the precautionary principle and the precautionary approach. Principle 15 of the Rio Declaration 1992 states that: “in order to protect the environment, the precautionary approach shall be widely applied by States according to their capabilities. Where there are threats of serious or irreversible damage, lack of full scientific certainty shall be not used as a reason for postponing cost-effective measures to prevent environmental degradation.” As Garcia (1995) pointed out, “the wording, largely similar to that of the principle, is subtly different in that: (1) it recognizes that there may be differences in local capabilities to apply the approach, and (2) it calls for cost-effectiveness in applying the approach, e.g., taking economic and social costs into account.” The ‘approach’ is generally considered a softening of the ‘principle’.

http://en.wikipedia.org/wiki/Precautionary_principle